Glad you like it! A few people have complained about the jumping, but I'm still not sure what is the problem. I mean, I get the unforgiving part, but could you elaborate on the "clunkyness" of it?
It seems more like the character is "floating" instead of jumping. Ideally, there are two things to consider:
1. The character should lose speed as it gets higher, so that the player can have a visual feedback on gravity.
2. I've noticed it's complicated to switch direction and fine-tune the jump distance mid-air, which makes the jump very awkward, especially in a pixel-perfect platformer.
There are some guides and tips by acclaimed game devs on this, I'd suggest looking out for a Twitter thread where the Celeste devs talk about some of the techniques used on the game (I don't have a link to it right now). Keep up the good work, I'd love to see an update to this!