The concept is really cool, and I think you use it in very inventive ways. It allows for a large variety of ways to go about the puzzle, though that may be a bit of a detriment, as the increased complexity means player could get easily confused. At least I did, though I'm admittedly not good at puzzle games. One problem I do have is the music. The tune is kind of repetitive, and gets old after a while. Good game!