Great game! Aside from the obvious charming visual style and SFX, I found the gameplay, dare I say, loop very satisfying. So much so that I've spent a few days chasing a 100+ high score, which I'm glad to have finally beaten:
If there's one suggestion I'd make: please speed up the beginning of the game. It could have the same enemies progression, but the speed of the slug feels too slow. Also, wall hugging is OP, but I wouldn't ask to change that, of course :)