For your first game, not bad! The controls are just a little stiff, and that clipping into a wall if you get past a certain size is a major issue, but the art and premise are both good, and you got the other basic mechanics down! Besides the obvious clipping bug, I'd also suggest giving the player immunity frames, both because it's jarring to take so much damage so quickly, and also the SFX for being hurt gets spammed in a very annoying way.