I like it. I think it's different enough from Celeste imo. It's pretty solid, but probably a bit too hard right off the bat (my games are often the same way). I'd suggest making the physics more lenient like more acceleration when moving and lower terminal velocity. Also, I'd make the camera linger on the deaths a bit so the player has a better sense of what they did wrong and then correct accordingly. It's still doable now, but it's pretty quick and hard to see exactly which spike hit me or visually seeing, oh I went just a tad to low on that try.
Great effort all around!