The art is incredible! Especially the hammer, that face is just hilarious. Wish I could even do anything close to that! The music is very nice too, together it give a very nice vibe to the whole game! It's just very sad to see the game in such a state, if it's more finished it will certain be one of the better ones in the jam.
After that's out of the way, I would say having a fixed camera would really benefit the game. Currently once the hammer is in a high position, it's quite hard to notice what's at the bottom of the level, and it really hurts the gameplay. And it's pair with the fact that the hitbox of the hammer is very large. I may be over guessing but it seems like it's just the bounding box for the whole sprite. I would suggest it being more generous to something like slightly smaller than the handle + the head.
Anyway, keep on making games and keep up the good work!