Pretty nice! I got the concept right away with the introduction level, and the difficulty progression was satisfactory. I will say though that two of the levels lock the tilt to the background, which I initially thought was some bug from switching windows, but was intentional. (Probably helps in making the solution easier to find?)
Although it seemed like the clashing colors would cause me problems, I was able to play through (in about an hour) without ever feeling sick. So good work on either the camera or motion blur or shader effects in avoiding problems there.