The idea that the healthbar is the size of the player is really cool! I'm unsure if it's a bug or a design decision, but you can't actually die in the game. You just end up being really small.
I also really liked the design of the enemies, some of them looked really nasty. The idea with the alien and the cheese is really funny and creative. All around, good job! I don't really know how it could be improved further.