Things I liked, I thought the controls were *very* smooth, I liked the feeling of sliding around as I played. The act of matching the colors to the correct squares was also cool and I really liked the fact that the circle got bigger the longer the game progressed without hitting anything.
Things I didn't like, I think your game would have benefited from some form of tutorial or some way to better have the player learn as they played. Even when I got hit by an obstacle it was hard to tell what happened and whether it was good or bad.
Other than that though, I think you should be very proud of where your game has ended up and I hope to see more games from you in the future.
- Von Harley