Some of the controls feels a bit clunky, I think, could use some coyote time, while jumping I couldn't attack on the way up, being able to hold down attack would also have nice. I also think the hitboxes are a little off sometimes. But it is a functional and complete game and it was fun enough, which is an accomplishment in a gam jam.
Going back to the beginning each time is pretty brutal, haha. Not necessarily bad if you're going for that, but it can get a bit repetitive.
The varying pixel sizes makes it feel a little un-cohesive
The music is cool, I really like the underground track. And the little bits of dynamic music was awesome.