Very out of control! It seems that the player character exerts a force on the world that makes it very difficult to change rotation while it's colliding with the walls, there might be some mass/friction settings you could mess with to improve the responsiveness.
I quite liked when the levels weren't enclosed and you had to freefall around the outside of the level.
I might also try making the character always facing upright with respect to gravity, it might be nice to have one point of consistency.
The clay backgrounds look great!