diff --git a/main.lua b/main.lua
index 10e3b12..d377299 100644
--- a/main.lua
+++ b/main.lua
@@ -30,7 +30,7 @@ function love.load()
     require "scene"
     require "game.vctrl"   -- VCTRL
 
-    scene = config.firstTime and InputConfigScene() or TitleScene()
+    SCENE = config.firstTime and InputConfigScene() or TitleScene()
 
     love.mouse.setVisible(false)
     love.window.setMode(love.graphics.getWidth(), love.graphics.getHeight(), {resizable = true});
@@ -77,7 +77,7 @@ function love.draw()
     love.graphics.clear()
     love.graphics.push()
 
-    scene:render()
+    SCENE:render()
     VCTRL.draw()
 
     -- -- Grid system
@@ -129,20 +129,20 @@ function love.keypressed(key, scancode)
     if scancode == "f4" then
         config["fullscreen"] = not config["fullscreen"]
         love.window.setFullscreen(config["fullscreen"])
-    elseif scancode == "f2" and scene.title ~= "Input Config" and scene.title ~= "Game" then
-        scene = InputConfigScene()
+    elseif scancode == "f2" and SCENE.title ~= "Input Config" and SCENE.title ~= "Game" then
+        SCENE = InputConfigScene()
     -- function keys are reserved
     elseif string.match(scancode, "^f[1-9]$") or string.match(scancode, "^f1[0-2]+$") then
         return
     -- escape is reserved for menu_back
     elseif scancode == "escape" or scancode == "acback" then
-        scene:onInputPress({input="menu_back", type="key", key=key, scancode=scancode})
+        SCENE:onInputPress({input="menu_back", type="key", key=key, scancode=scancode})
     -- pass any other key to the scene, with its configured mapping
     else
         if config.input and config.input.keys then
             input_pressed = config.input.keys[scancode]
         end
-        scene:onInputPress({input=input_pressed, type="key", key=key, scancode=scancode})
+        SCENE:onInputPress({input=input_pressed, type="key", key=key, scancode=scancode})
     end
 
     LastPressedKey = input_pressed or scancode
@@ -153,7 +153,7 @@ function love.keyreleased(key, scancode)
 
     -- escape is reserved for menu_back
     if scancode == "escape" or scancode == 'acback' then
-        scene:onInputRelease({input="menu_back", type="key", key=key, scancode=scancode})
+        SCENE:onInputRelease({input="menu_back", type="key", key=key, scancode=scancode})
     -- function keys are reserved
     elseif string.match(scancode, "^f[1-9]$") or string.match(scancode, "^f1[0-2]+$") then
         return
@@ -162,7 +162,7 @@ function love.keyreleased(key, scancode)
         if config.input and config.input.keys then
             input_released = config.input.keys[scancode]
         end
-        scene:onInputRelease({input=input_released, type="key", key=key, scancode=scancode})
+        SCENE:onInputRelease({input=input_released, type="key", key=key, scancode=scancode})
     end
 
     LastReleasedKey = input_released or scancode
@@ -178,7 +178,7 @@ function love.joystickpressed(joystick, button)
     then
         input_pressed = config.input.joysticks[joystick:getName()].buttons[button]
     end
-    scene:onInputPress({input=input_pressed, type="joybutton", name=joystick:getName(), button=button})
+    SCENE:onInputPress({input=input_pressed, type="joybutton", name=joystick:getName(), button=button})
 end
 
 function love.joystickreleased(joystick, button)
@@ -191,7 +191,7 @@ function love.joystickreleased(joystick, button)
     then
         input_released = config.input.joysticks[joystick:getName()].buttons[button]
     end
-    scene:onInputRelease({input=input_released, type="joybutton", name=joystick:getName(), button=button})
+    SCENE:onInputRelease({input=input_released, type="joybutton", name=joystick:getName(), button=button})
 end
 
 function love.joystickaxis(joystick, axis, value)
@@ -212,10 +212,10 @@ function love.joystickaxis(joystick, axis, value)
         negative_released = config.input.joysticks[joystick:getName()].axes[axis].negative
     end
     if math.abs(value) >= 1 then
-        scene:onInputPress({input=input_pressed, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
+        SCENE:onInputPress({input=input_pressed, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
     else
-        scene:onInputRelease({input=positive_released, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
-        scene:onInputRelease({input=negative_released, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
+        SCENE:onInputRelease({input=positive_released, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
+        SCENE:onInputRelease({input=negative_released, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
     end
 end
 
@@ -247,20 +247,20 @@ function love.joystickhat(joystick, hat, direction)
             local char = direction:sub(i, i)
             local _, count = last_hat_direction:gsub(char, char)
             if count == 0 then
-                scene:onInputPress({input=config.input.joysticks[joystick:getName()].hats[hat][char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
+                SCENE:onInputPress({input=config.input.joysticks[joystick:getName()].hats[hat][char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
             end
         end
         for i = 1, #last_hat_direction do
             local char = last_hat_direction:sub(i, i)
             local _, count = direction:gsub(char, char)
             if count == 0 then
-                scene:onInputRelease({input=config.input.joysticks[joystick:getName()].hats[hat][char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
+                SCENE:onInputRelease({input=config.input.joysticks[joystick:getName()].hats[hat][char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
             end
         end
         last_hat_direction = direction
     elseif has_hat then
         for i, direction in ipairs{"d", "l", "ld", "lu", "r", "rd", "ru", "u"} do
-            scene:onInputRelease({input=config.input.joysticks[joystick:getName()].hats[hat][direction], type="joyhat", name=joystick:getName(), hat=hat, direction=direction})
+            SCENE:onInputRelease({input=config.input.joysticks[joystick:getName()].hats[hat][direction], type="joyhat", name=joystick:getName(), hat=hat, direction=direction})
         end
         last_hat_direction = ""
     elseif direction ~= "c" then
@@ -268,20 +268,20 @@ function love.joystickhat(joystick, hat, direction)
             local char = direction:sub(i, i)
             local _, count = last_hat_direction:gsub(char, char)
             if count == 0 then
-                scene:onInputPress({input=directions[char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
+                SCENE:onInputPress({input=directions[char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
             end
         end
         for i = 1, #last_hat_direction do
             local char = last_hat_direction:sub(i, i)
             local _, count = direction:gsub(char, char)
             if count == 0 then
-                scene:onInputRelease({input=directions[char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
+                SCENE:onInputRelease({input=directions[char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
             end
         end
         last_hat_direction = direction
     else
         for i, direction in ipairs{"d", "l", "ld", "lu", "r", "rd", "ru", "u"} do
-            scene:onInputRelease({input=nil, type="joyhat", name=joystick:getName(), hat=hat, direction=direction})
+            SCENE:onInputRelease({input=nil, type="joyhat", name=joystick:getName(), hat=hat, direction=direction})
         end
         last_hat_direction = ""
     end
@@ -315,8 +315,8 @@ function love.run()
             end
         end
 
-        if scene and scene.update and love.timer then
-            scene:update()
+        if SCENE and SCENE.update and love.timer then
+            SCENE:update()
 
             local frame_duration = 1.0 / TARGET_FPS
             if time_accumulator < frame_duration then
diff --git a/scene.lua b/scene.lua
index b6ae4bb..f2eeae2 100644
--- a/scene.lua
+++ b/scene.lua
@@ -1,12 +1,12 @@
 local Object = require "libs.classic"
 
-Scene = Object:extend()
+SCENE = Object:extend()
 
-function Scene:new() end
-function Scene:update() end
-function Scene:render() end
-function Scene:onInputPress() end
-function Scene:onInputRelease() end
+function SCENE:new() end
+function SCENE:update() end
+function SCENE:render() end
+function SCENE:onInputPress() end
+function SCENE:onInputRelease() end
 
 ExitScene = require "scene.exit"
 GameScene = require "scene.game"
diff --git a/scene/exit.lua b/scene/exit.lua
index bd1fd16..095e8f1 100644
--- a/scene/exit.lua
+++ b/scene/exit.lua
@@ -1,4 +1,4 @@
-local ExitScene = Scene:extend()
+local ExitScene = SCENE:extend()
 require 'load.save'
 
 ExitScene.title = "Exit Game"
diff --git a/scene/fullscreen.lua b/scene/fullscreen.lua
index 0dc9b78..c36972d 100644
--- a/scene/fullscreen.lua
+++ b/scene/fullscreen.lua
@@ -1,4 +1,4 @@
-local FullscreenScene = Scene:extend()
+local FullscreenScene = SCENE:extend()
 require 'load.save'
 
 FullscreenScene.title = "Fullscreen"
@@ -10,7 +10,7 @@ function FullscreenScene:update()
     config["fullscreen"] = not config["fullscreen"]
     saveConfig()
     love.window.setFullscreen(config["fullscreen"])
-    scene = TitleScene()
+    SCENE = TitleScene()
 end
 
 function FullscreenScene:render()
diff --git a/scene/game.lua b/scene/game.lua
index 5b663ff..7fe0500 100644
--- a/scene/game.lua
+++ b/scene/game.lua
@@ -1,4 +1,4 @@
-local GameScene = Scene:extend()
+local GameScene = SCENE:extend()
 
 GameScene.title = "Game"
 local tas = false
@@ -68,11 +68,11 @@ end
 
 function GameScene:onInputPress(e)
     if (self.game.game_over or self.game.completed) and (e.input == "menu_decide" or e.input == "menu_back" or e.input == "rotate_right") and self.game.game_over_frames > 50 then
-        scene = TitleScene()
+        SCENE = TitleScene()
     elseif tas and e.input == "menu_decide" then
         self:update(false, true)
     elseif self.game.input_playback and (e.input == "menu_back") then
-        scene = TitleScene()
+        SCENE = TitleScene()
     elseif self.game.input_playback and e.input == "rotate_left" then
         self.paused = false
         self:update()
diff --git a/scene/input_config.lua b/scene/input_config.lua
index db73477..af0bc59 100644
--- a/scene/input_config.lua
+++ b/scene/input_config.lua
@@ -1,4 +1,4 @@
-local ConfigScene = Scene:extend()
+local ConfigScene = SCENE:extend()
 
 ConfigScene.title = "Input Config"
 
@@ -39,13 +39,13 @@ function ConfigScene:render()
 end
 
 function ConfigScene:changeOption(rel)
-    local len = table.getn(menu_screens)
+    local len = #menu_screens
     self.menu_state = (self.menu_state + len + rel - 1) % len + 1
 end
 
 function ConfigScene:onInputPress(e)
     if e.input == "menu_decide" or e.input == "rotate_left" or e.scancode == "return" then
-        scene = menu_screens[self.menu_state]()
+        SCENE = menu_screens[self.menu_state]()
     elseif e.input == "up" or e.scancode == "up" then
         self:changeOption(-1)
     elseif e.input == "down" or e.scancode == "down" then
@@ -53,7 +53,7 @@ function ConfigScene:onInputPress(e)
     elseif config.input and (
         e.input == "menu_back" or e.input == "rotate_right" or e.scancode == "backspace" or e.scancode == "delete"
     ) then
-        scene = TitleScene()
+        SCENE = TitleScene()
     end
 end
 
diff --git a/scene/key_config.lua b/scene/key_config.lua
index ed3714c..e1f1cbc 100644
--- a/scene/key_config.lua
+++ b/scene/key_config.lua
@@ -1,4 +1,4 @@
-local KeyConfigScene = Scene:extend()
+local KeyConfigScene = SCENE:extend()
 
 KeyConfigScene.title = "Key Config"
 
@@ -58,7 +58,7 @@ function KeyConfigScene:render()
             drawText(self.set_inputs[input], 240, 50 + i * 20, 300, "left")
         end
     end
-    if self.input_state > table.getn(configurable_inputs) then
+    if self.input_state > #configurable_inputs then
         drawText("Press enter to confirm, delete/backspace to retry" .. (config.input and ", escape to cancel" or ""),0,0,1000)
     else
         drawText("Press key input for " .. input_names[configurable_inputs[self.input_state]] .. ", tab to skip, escape to cancel",0,0,1000)
@@ -70,12 +70,12 @@ function KeyConfigScene:onInputPress(e)
     if e.type == "key" then
         -- function keys, escape, and tab are reserved and can't be remapped
         if e.scancode == "escape" then
-            scene = InputConfigScene()
-        elseif self.input_state > table.getn(configurable_inputs) then
+            SCENE = InputConfigScene()
+        elseif self.input_state > #configurable_inputs then
             if e.scancode == "return" then
                 config.input.keys = self.new_input
                 saveConfig()
-                scene = config.firstTime and TitleScene() or InputConfigScene()
+                SCENE = config.firstTime and TitleScene() or InputConfigScene()
                 config.firstTime = false
             elseif e.scancode == "delete" or e.scancode == "backspace" then
                 -- retry
diff --git a/scene/music_toggle.lua b/scene/music_toggle.lua
index 33163df..7ef0227 100644
--- a/scene/music_toggle.lua
+++ b/scene/music_toggle.lua
@@ -1,4 +1,4 @@
-local MusicToggleScene = Scene:extend()
+local MusicToggleScene = SCENE:extend()
 require 'load.save'
 
 MusicToggleScene.title = "Play music during game:"
@@ -9,7 +9,7 @@ end
 function MusicToggleScene:update()
     config["music"] = not config["music"]
     saveConfig()
-    scene = TitleScene()
+    SCENE = TitleScene()
 end
 
 function MusicToggleScene:render()
diff --git a/scene/name_entry.lua b/scene/name_entry.lua
index ec8a2c1..d5babaf 100644
--- a/scene/name_entry.lua
+++ b/scene/name_entry.lua
@@ -1,4 +1,4 @@
-local NameEntryScene = Scene:extend()
+local NameEntryScene = SCENE:extend()
 local Grid = require 'game.grid'
 local bitser = require 'libs.bitser'
 require 'load.save'
@@ -117,7 +117,7 @@ function NameEntryScene:onInputPress(e)
         if self.entry_pos == 4 then
             config['last_entry'] = name:upper()
             saveConfig()
-            scene = GameScene(name:lower())
+            SCENE = GameScene(name:lower())
         else
             if self.entry_pos == 3 then
                 name = string.lower(self.name_entry[1]..self.name_entry[2]..self.name_entry[3])
@@ -146,7 +146,7 @@ function NameEntryScene:onInputPress(e)
         self.delete_confirm = false
         self.delete_input_count = 0
         if self.entry_pos == 1 then
-            scene = TitleScene()
+            SCENE = TitleScene()
         else
             self.name_entry[self.entry_pos] = 'A'
             self.name_entry[self.entry_pos-1] = 'A'
diff --git a/scene/replay.lua b/scene/replay.lua
index 84d2083..26e7264 100644
--- a/scene/replay.lua
+++ b/scene/replay.lua
@@ -1,5 +1,5 @@
 require 'funcs'
-local ReplaySelectScene = Scene:extend()
+local ReplaySelectScene = SCENE:extend()
 
 ReplaySelectScene.title = "Replay"
 
@@ -77,7 +77,7 @@ function ReplaySelectScene:render()
 end
 
 function ReplaySelectScene:changeOption(rel)
-    local len = table.getn(self.replays)
+    local len = #self.replays
     self.replay_select = self.replay_select + rel
     if self.replay_select + ((self.page-1) * self.page_flip) > len then
         self.page = 1
@@ -107,7 +107,7 @@ function ReplaySelectScene:onInputPress(e)
     selected_replay_text = self.replay_text[self.replay_select + ((self.page-1) * self.page_flip)]
     if e.input == "menu_decide" or e.input == "rotate_left" or e.scancode == "return" then
         if self.replays[1] == nil then 
-            scene = TitleScene()
+            SCENE = TitleScene()
         --if not self.dialog then
         --    self.dialog_select = 1
         --    self.dialog = true
@@ -130,19 +130,19 @@ function ReplaySelectScene:onInputPress(e)
             end
             player_name = line_components[1]
             player_grade = string.gsub(line_components[2], " ", "")
-            scene = GameScene(player_name, selected_replay, player_grade)
+            SCENE = GameScene(player_name, selected_replay, player_grade)
         end
     elseif e.input == "up" or e.scancode == "up" then
-        if self.replays[1] == nil then scene = TitleScene() end
+        if self.replays[1] == nil then SCENE = TitleScene() end
         if not self.dialog then self:changeOption(-1)
         else self:changeDialog(-1) end
     elseif e.input == "down" or e.scancode == "down" then
-        if self.replays[1] == nil then scene = TitleScene() end
+        if self.replays[1] == nil then SCENE = TitleScene() end
         if not self.dialog then self:changeOption(1)
         else self:changeDialog(1) end
     elseif e.input == "menu_back" or e.input == "rotate_right" or e.scancode == "backspace" or e.scancode == "delete" then
-        if self.replays[1] == nil then scene = TitleScene() end
-        if not self.dialog then scene = TitleScene()
+        if self.replays[1] == nil then SCENE = TitleScene() end
+        if not self.dialog then SCENE = TitleScene()
         else self.dialog = false end
     end
 end
diff --git a/scene/stick_config.lua b/scene/stick_config.lua
index a548603..1d14e3e 100644
--- a/scene/stick_config.lua
+++ b/scene/stick_config.lua
@@ -1,4 +1,4 @@
-local StickConfigScene = Scene:extend()
+local StickConfigScene = SCENE:extend()
 
 StickConfigScene.title = "Controller Config"
 
@@ -58,7 +58,7 @@ function StickConfigScene:render()
             drawText(self.set_inputs[input], 240, 50 + i * 20, 300, "left")
         end
     end
-    if self.input_state > table.getn(configurable_inputs) then
+    if self.input_state > #configurable_inputs then
         drawText("Press enter to confirm, delete/backspace to retry" .. (config.input and ", escape to cancel" or ""), 0, 0, 1000)
     else
         drawText("Press joystick input for " .. input_names[configurable_inputs[self.input_state]] .. ", tab to skip, escape to cancel", 0, 0, 1000)
@@ -77,15 +77,15 @@ function StickConfigScene:onInputPress(e)
     if e.type == "key" then
         -- function keys, escape, and tab are reserved and can't be remapped
         if e.scancode == "escape" then
-            scene = InputConfigScene()
-        elseif self.input_state > table.getn(configurable_inputs) then
+            SCENE = InputConfigScene()
+        elseif self.input_state > #configurable_inputs then
             if e.scancode == "return" then
                 -- save new input, then load next scene
                 local had_config = config.input ~= nil
                 if not config.input then config.input = {} end
                 config.input.joysticks = self.new_input
                 saveConfig()
-                scene = had_config and InputConfigScene() or TitleScene()
+                SCENE = had_config and InputConfigScene() or TitleScene()
             elseif e.scancode == "delete" or e.scancode == "backspace" then
                 -- retry
                 self.input_state = 1
@@ -97,7 +97,7 @@ function StickConfigScene:onInputPress(e)
             self.input_state = self.input_state + 1
         end
     elseif string.sub(e.type, 1, 3) == "joy" then
-        if self.input_state <= table.getn(configurable_inputs) then
+        if self.input_state <= #configurable_inputs then
             if e.type == "joybutton" then
                 addJoystick(self.new_input, e.name)
                 if not self.new_input[e.name].buttons then
diff --git a/scene/title.lua b/scene/title.lua
index 82d5e09..fa616cd 100644
--- a/scene/title.lua
+++ b/scene/title.lua
@@ -1,4 +1,4 @@
-local TitleScene = Scene:extend()
+local TitleScene = SCENE:extend()
 require 'load.save'
 require 'funcs'
 
@@ -83,13 +83,13 @@ function TitleScene:render()
 end
 
 function TitleScene:changeOption(rel)
-    local len = table.getn(main_menu_screens)
+    local len = #main_menu_screens
     self.main_menu_state = (self.main_menu_state + len + rel - 1) % len + 1
 end
 
 function TitleScene:onInputPress(e)
     if e.input == "menu_decide" or e.input == "rotate_left" or e.scancode == "return" then
-        scene = main_menu_screens[self.main_menu_state]()
+        SCENE = main_menu_screens[self.main_menu_state]()
     elseif e.input == "up" or e.scancode == "up" then
         self:changeOption(-1)
     elseif e.input == "down" or e.scancode == "down" then
diff --git a/scene/training.lua b/scene/training.lua
index 08bf6ef..72791ea 100644
--- a/scene/training.lua
+++ b/scene/training.lua
@@ -1,4 +1,4 @@
-local TrainingScene = Scene:extend()
+local TrainingScene = SCENE:extend()
 
 TrainingScene.title = "Max Gravity Training"
 
@@ -46,9 +46,9 @@ end
 
 function TrainingScene:onInputPress(e)
     if (self.game.game_over or self.game.completed) and (e.input == "menu_decide" or e.input == "menu_back" or e.input == "rotate_right") and self.game.game_over_frames > 50 then
-        scene = TitleScene()
+        SCENE = TitleScene()
     elseif (e.input == "menu_back") then
-        scene = TitleScene()
+        SCENE = TitleScene()
     elseif e.input and string.sub(e.input, 1, 5) ~= "menu_" then
         self.inputs[e.input] = true
     end