Cool game! A couple things that I would change:
-The rewind mechanic isn't really that important to the game, and I could beat levels without using it
-All of the levels were pretty similar, and they didn't force me to use the environment to my advantage. Most of the time I could just run along the floor spamming "q" (Which BTW I would change that to something that I can press with my right hand, because I can't press "q" and "a" at the same time)
-More feedback for when the player is getting damaged
All that being said I thought your game was really interesting and I had a fun time playing it.