I really like the concept, could do wild things with it!
I was left without a clue when I failed a puzzle in the third stage though. I locked myself and had no idea if there was a way to fix that. I didn't feel like starting over from scratch even though it's only a few short levels.
The color tone for past and future are fun, lol. Maybe a future iteration could have past, present, and future, and all kinds of odd ways to alter one another.