Thank you!
The idea of changing the window scale is a native feature in love-2d, and I think most users of this framework use this feature.
Yes I spent more time on the levels than coding the game itself, but in my opinion they are not good yet. If I'm not lazy, I'll update the levels.
The game code will be on github at the end of the ratings.
It's very badly coded, but I'll add comments to make it easier to understand.