This game is really cool - has a lot of good game feel, very nice art. Would definitely work well as an open level stage by stage game.
My feedback is that the response on the roll is a little bit slow, the head drops down but by then the character has already moved most of the roll distance. Animation could be more instant in that case. Some added screenshake or other visual vignette effect would be helpful in giving more for letting the player know when they've taken damage.
All in all fun, would be interested in seeing how far this could go.