Congrats for completing a nice game for the GameJam! Some comments:
- I like the pixel art graphics & the animations
- The atmosphere of the game feels pretty 2d-darksoul-ish, not bad!
- I feel that this rewind mechanic is pretty standard in a platform game though. It pretty much brings you back to an earlier checkpoint when you die. From my play, most of the time I ignore the ctrl to rewind, until I die, so i can try again
Overall, good work!