Really cool game, I had a lot of fun playing! I enjoyed the simple art and the animations like the clocks actually turning back in time as you rewind them.
I found timing when to jump to get a boost from a moving platform quite difficult to get right. And I really didn't like having the jump key right next to the rewind key, since it wasn't a key you'd usually get for jump I kept forgetting if it was J or K :D W or space would've been much better. And I don't think your tutorial at the beginning mentioned how to jump, so I had to go back to the main menu to look at game controls. I couldn't hear any background music either and I think this would've made the game a lot better and more immersive.
This definitely deserves more ratings and feels very polished and fun though, really great job! :D