This was a lot of fun! It fit the theme perfectly, was quick to pick up, and smooth to play the entire way through. One small suggestion would be to put a light or something to indicate the exact level endpoint to the player, a couple of times I made it to the little dark area and didn't move to the next level right away.
I liked your rewind effects, and I also thought it was a good use of in-game "UI" to have your gun glow when your powers were ready.