really great puzzle game, the premise is simple and yet each level was a real challenge for me. The music was a huge treat, did you make that youself? It was fantastic and perfect for this game, kept me going in my thinking mood.
btw at first I thought I was collecting music notes lol until I realized those were keys.
the only thing I would add is the ability to quickly reset a level rather than have the player trace back each step, but it was definitely not a game blocker for me.
great job!