Change fade to grey to not use a tween

main.lua

@@ -305,7 +305,7 @@ function love.load(arg)
 
   game.game_over_image = love.graphics.newImage('images/game_over.png')
   game.game_over = false
-  game.fade_to_grey_tween = {p = 1.0}
+  game.fade_to_grey = {time = 0, duration = 120, progress = 0.0}
   game.paused = false
   game.frame_by_frame = false
 
@@ -426,15 +426,13 @@ function love.load(arg)
 end
 
 function love.update(dt)
-  if game.game_over and game.fade_to_grey_tween.p < 1.0 then
+  if game.game_over then
-    game.fade_to_grey_tween.t = game.fade_to_grey_tween.t + 1
+    if game.fade_to_grey.time < game.fade_to_grey.duration then
-    game.fade_to_grey_tween.p = easing.linear(
+      game.fade_to_grey.time = game.fade_to_grey.time + 1
-      game.fade_to_grey_tween.t,
+      game.fade_to_grey.progress =
-      game.fade_to_grey_tween.b,
+        game.fade_to_grey.time / game.fade_to_grey.duration
-      game.fade_to_grey_tween.c,
+      game.shader:send("progress", game.fade_to_grey.progress)
-      game.fade_to_grey_tween.d
+    end
-    )
-    game.shader:send("progress", game.fade_to_grey_tween.p)
   end
 
   if game.paused or game.game_over then
@@ -475,7 +473,8 @@ function love.update(dt)
       if game.bubble_slots[i].bubble_type ~= 0 and
          game.bubble_slots[i].y > game.level_bottom then
         game.game_over = true
-        game.fade_to_grey_tween = {t = 0, d = 120, b = 0, c = 1, p = 0.0}
+        game.fade_to_grey.time = 0
+        game.fade_to_grey.progress = 0.0
       end
     end
     if game.game_over then
@@ -523,7 +522,8 @@ function love.update(dt)
 
       if #matches < 3 and game.current_bubble.y > game.level_bottom then
         game.game_over = true
-        game.fade_to_grey_tween = {t = 0, d = 120, b = 0, c = 1, p = 0.0}
+        game.fade_to_grey.time = 0
+        game.fade_to_grey.progress = 0.0
         return
       end
 
@@ -864,7 +864,7 @@ function love.draw(alpha)
   end
 
   -- draw game over
-  if game.game_over and game.fade_to_grey_tween.p == 1.0 then
+  if game.game_over and game.fade_to_grey.progress == 1.0 then
     love.graphics.setColor(0, 0, 0, 0.8)
     love.graphics.rectangle(
       'fill',