It is a great game, it's one of the best i've played yet (over more than 30), but it has room to improve:
-As some comments say, sometimes it rewinds the jumps and the movement separately, making you jump straight up and moving left or right when you did a left-jump.
-I feel like when you are recording and when you use the rewind, some audio would have been nice. While recording i dont know, but typical tape rewind sound while in rewind mode would have been great, with less volume than the background music.
-Level 2 and 3 are harder than any level after them.
-SPRINGS GO WEEEE
Good game, and cool mechanic, good job :P