I like this game a lot, it has a lot of polish, this is very impressive if it's a solo developer. The music slaps and the pixel art looks nice and is well animated. Gameplay is engaging and fun, you can tell the developer knows what they're doing.
Here's some personal gripes though:
The attack hitbox is too small at higher weights
The game is a little too difficult (for me at least)
It would be nice if you could break blocks with your head
The window for bouncing off blocks is too small