Very good game and its feel and looks are on the top. Well done!!
When you pass the part with blue and purple gate with the wrong color for the next gate (gate where you need to be very long) I believe there is no way to get the correct color back from the previous part. It might not be the case maybe i didn't realised any other way and restarted the game.
Other than that it's a cool and good-looking game. It really put me in a flow zone for a long time with the music and mechanics :D