The art is excellent. However, the transition between standing and running, or rising and falling, seems jarring. I would recommend a transition animation.
I am encountering a bug after receiving the powerslice ability. The attack meter for the enemies does not change, so the enemies do not attack, and when I try to use a power attack, I am left unable to use any attack at all. It prevents me from continuing the game.
The game is good, but all the confirmation menus bog it down. If one click completed the purchases and the other options, it would be much easier to buy in larger quantities, and would overall speed up the game.