I liked the rewind feature a lot! You know that feel when you like "whaaaat...how i suppose to do it?" Spent some time and understand it! It's feel great.
Then the mechanics begin where you need to think and jump quickly at the same time, and with the second I always have problems. The third lvl (where there is a small waterfall) knocked me down a little, but I remembered (because I read HOW TO PLAY) and changed to a general view of the lvl. On the next lvl you remind it, but it would be better if you do it early). The ability to rewind seems to me to be used up very quickly. I don't think that it is necessary to change this, if the restart of the lvl took place instantly (without a splash screen that takes time) it would be less painful. In any case, a really interesting and complete (most importantly) game. It's always nice to play a game where you can complete whole lvls, pause, quit, restart, or mute the sound! Polished! Great job!