Nice and fun game! I really like how you kind of teasered the second part of the level already! Though since this is a 2D plattformer, I have some material for you to improve on the game design on these parts, as the game feel is one of the most essential parts in 2D plattformers:
First of all, the character movement, you may or may not have heard of the so called coyote time and jump buffer, these are techniques to improve the player's experience a lot by giving them extra time to still jump even after leaving the ground and if the player shortly pressed jump before hitting the ground, he still jumps. And my biggest issue with the player was, that the jumps were not controllable - which made a lot of jumps more frustrating than they need to be. If you want some further informations, I'd suggest you looking into GMTK's Video about Celeste's Movement and the Plattformer Toolkit:
Another Thing was that the levels were a bit overwhelming, especially the first one! It's often times better to gradually introduce the player to new features and gimmicks, of course this is a game jam, so it might have been due to time management reasons, but I still strongly reccommend you looking into these two videos about level design:
The first is about how your level layout should be in general and the second one is how celeste introduces you it's new mechanics.
Another thing that might be intresting is synergy between the objects in your game, since if you design your objects to interact well enough, it can also create some intressing levels, but that's really hard to implement, so it's just something minor. Here is a video that talks a bit about it (and is in my opinion generally intresting) :
Also don't be scared because of this gigantic wall of text, it's just some stuff, that I reccommend people to watch, when making a 2D Plattformer, your game was quite good!
That should be a all from me, the comment got a bit long tho.