Nice music, good color scheme, and attractive parallax backgrounds.
I had a lot of trouble understanding how to work the puzzles. There was a short tutorial at the beginning, which is good, but it just wasn't quite enough for me to figure it out.
Also, note that the Reset button appears near the center of the screen, which is quite inconvenient. UI elements should generally be anchored to the side, top, or bottom of the screen. :)