The physics are probably some of the least functional I've seen in a game like this. So many operations (grinding and jumping direction) are based on momentum rather than input, but the momentum is so slippery and difficult to control that I find myself doing things I don't want to be doing. It feels more like I'm just slightly influencing the movement, say, a ball bearing, rather than controlling an actual character.
The camera feels a little sluggish, but it's honestly not a huge deal. I just wish it was snappier, and not overly smoothed like it seems to be right now.
Aside from my gripes above, I like the art direction and overall style of the game. It's a very pretty visual style. This game seems like it has potential, but the control issues are giving it a hard time.