I liked the concept a lot, being a huge Braid fan, the idea of including rewinding time as part of the mechanics is something that i like a lot. I had a lot of trouble playing it, though. I couldn't get past the second level because, I figured (thought) that you were meant to stand on the green platform on the left so that the block on the right side slides up, jump towards the right, stand next to that block and rewind the time so that it slides up, that didn't happen. I gave it a few tries. Granted, i'm not super skilled and it may have taken me too long, but there's no feedback as to how far we are rewinding, so it's really hard to tell if I took too long or misunderstood the mechanics completely. I liked the visuals a lot, shame there are no sounds.
All in all a very cool concept, hope you keep working on it!!