Hello.
I have some feedback for your game:
Firstly, as GhostBitStudios said, it's really confusing and weird that after you win a level you go back to the main menu. It'd have been better if after you beat a level you just go to the next one, like in most games.
Secondly, I feel like your game lacks mechanics. Why that? You can only take damage and go small. That's it. IMO, you should have added more mechanics such as: after you get hit you change colors and you can only go through certain doors if you have a specific color or a way to get bigger after getting smaller, etc;
Thirdly, I liked the SFX for your game but it has no music. Music always adds to the gameplay.
Furthermore, I really liked your main menu but felt like the "Lag" option was useless. There is no lag whatsoever.
Lastly, the way your game "fits" the theme feels more as if the theme was "Less is less".
I beat the game anyway:
