Nicely done! I liked how the platforming can be difficult, making the game more interesting. The rewind mechanic is also the first time I've seen someone use it in this way! (I've played around 140 games so it's pretty original!)
I think a small coyote time would be really helpful since jumping off ledges can be hard. Also, some of the level design is a bit too simple. For example, I could just set the rewind at the door and grab the key within 3 seconds and I would be done. Maybe make it a bit more interesting by introducing different mechanics! Lastly, maybe some more levels since I really enjoyed it :D
Overall, you did a great job! If you ever decide to make a post-jam version, I would love to play it!