It's conceptually interesting.
As said below, the mechanics are a bit hard to grasp. Eventually, you do find out what the game wants of you but since your reaction window is so small you're likely to be hit with many game overs that make no sense at first. I think the game would be a lot better if things were slowed down a little.
It's graphically nice, but a bit... mixelly? I don't know. The circle around your character seems to be a higher ress than is possible, though that isn't the case as the ress is 160 x 144. Bit strange.
The overall presentation is competent, however. And the music is pretty good. I just wish you could resize the window.