Very solid game. The parts where you stick to your core color scheme look pretty cool.
I agree that the controls feel a bit unresponsive. Sometimes you press or release a button and nothing is happening for no apparent reason.
You could probably simplify this game even further by getting rid of the purple turn around blocks. Just make the player turn around whenever you hit a wall. That would reduce the clutter and prevent the player from getting stuck in a corner (happend to me in level 3).
Pretty interesting that you jump when you release the button instead of doing it when you press it down. Takes some getting used to, but I really like it, cause I haven't seen that before.
Overall pretty clever game. Good job.