Really neat concept! I like how you utilized theme in such a way that it's not us who have control over the "rewind mechanics". Gameplay wise, the game was fun to play, though it felt a bit short and controls were a little bit unresponsive (there were moments in which it felt like I pressed the space just in time, but the player still didn't jump).
Sound and art style were nice :)
Viewing post in Broken Times jam comments
Pretty standard situation - while running towards the edge of the platform and pressing jump right before it's end. I would suggest adding a little timeframe right after you leave the ground during which you can still perform a jump. In such fast-paced game it could really give an illusion of much bigger responsiveness.