This is a fun concept, and I love the graphics and music. They're great. The one thing that stopped me from beating the game, though, were the controls. It's hard to tell where the hand is going to land as well as control the player. I think if you added some sort of targeting/drew something on screen to give the user feedback on where exactly they're headed would help a lot. That, and play around more with the physics although like Phil said, kudos for doing a physics game!
Ooo, also reading Griddolini's comment and completely agree about punching an enemy might cause you to get pushed back and such. Very Ori and the Blind Forest, actually!