Awesome game. One thing I would like to bring up, not necessarily as a criticism but one thing I noticed:
When I opened the game for the first time, I played the first level, but after that I unconsciously chose the level to the RIGHT of me. I thought it was level 2. I didn't know it was level 3 until I left the level. Might be due to how we typically 'read' from left to right.

EDIT:
Just cleared stage 7, what a blast! And the unlocked costume too? Cute!!

I know this is a game jam game so what you have here is already excellent, but if there was anything I would add to the game if I wanted to expand upon it:
- I noticed there already is coyote time but if you extended it MORE like how Wings of Vi is designed, that might be pretty interesting. So not exactly a double-jump, cause you still want every jump to be a commitment and you don't want the game to be too easy, but now players can clutch themselves back onstage easier.
- being actionable 0.2-0.3s after getting knocked back, so although you took considerable knockback, there's still a slim chance of making it back to the platform, like it was Smash (this would only make sense to implement if you had the infinite coyote time jump or a double-jump though)
- potential unlockables for the player could be extending the broom hitbox, double-jump, making the ground-pound have a hitbox & shockwave

Just thoughts of mine on what one could do to put even more depth into this cute game. Thanks for making such a short-n-sweet experience!