Cool game but I think there's two little problems.
1 - The animation for rewind takes too long, it would be great if it would be faster so I can go back to play (maybe you could do a fast backwards effect with some cool distortion or something like that)
2 - In some parts you have to die too much, I already now what to do and how to do and now I just have to keep dying to get there. This is more of a personal opinion tho.