I really enjoyed this game, I'm amazed you managed to make all this and so many levels in only 1 week! I managed to complete the game too :D I liked what you did with the rewind mechanic here and I thought the game looked really nice. Oh and I love the puzzle piece transition between the levels!
Some things that I feel like could be improved are:
- Player movement: The jumping didn't very smooth or reactive - I had to wait a bit after pressing jump before the player actually jumped. The slidey movement I found a bit weird too, with the acceleration and deceleration. The jumps betwen singular spikes was very hard to get right because of this.
- Rewind: Watching the whole thing again in rewind felt quite long and slow, it would've been nice if it was sped up especially if the player was going to die anyway.
- Jump key: Don't know if it's just me but having it on the Z key was super weird. Maybe W, up arrow or space would've been better?
Other than that, really great job! The game felt super polished.