Pretty cool! Glad to see the platformer I've heard so much about is done. Some notes:
- Controls don't feel right, which can probably be fixed by changing restart to the r key so it is next to time stop.
- Pushing might need to be a little stronger, I really struggled with gaining enough height on the second level.
- There are occasional cases where the player can't jump when overhanging a platform. This happened to me once or twice, but the hitbox for checking if the player is grounded may need to be a bit wider.
Other than that, super cool idea and it worked out.