surprised I haven't seen more games like this - rhythm games are already a somewhat hypnotic experience, so this is a perfect match. The music is great. Energetic, which is not necessarily what you'd expect for this kind of premise, but still with a kinda' hypnotic quality.
I'm afraid I must echo the criticism that having to follow the dots to the outer edges kinda' distracts from the spiral. Perhaps if they went from the outside in?
But overall some nice work!