The levels are really polished. The graphics are very good and the music matches the atmosphere perfectly. Overall a very well executed game which leaves me with not much to say...
However, I will nitpick, because that's what we are here for :)
- The obvious one is lack of menu or introduction, but I didn't really care so I won't say more about it.
- I think that the different styles of floors didn't bring any value, and actually distracted me the first times because I wasn't sure if the "new" floor was safe. I would have kept the levels with one unique style each.
- When "rewinding" against a wall, I would have loved a small animation letting me know the movement had "failed".
That's about it. Good job on your game, I really enjoyed it.