It's Ok, my favourite part was probably the music, very demo-scene in the background. Really needs a warning when the colour is about to change or a grace period that stops the last colour killing you for a while.
I'd have preferred if there was a bit less momentum to the player - less time between start of acceleration and top speed, and movement key release and stop but that's just me. Maybe the speed of the rings would need to be sped up to balance the difficulty if that happened but IMO solid controls on a hard game is hard to beat: make the player feel like when they die it was because they weren't quick enough on the controls, not that the controls weren't responsive enough.
gl with future games.