I like the fast pace nature of this one, but the jump is very floaty and it doesn't have much fine control on it, it always jump the same height regardless of me tapping very quickly the spacebar or holding the spacebar, I think it would benefit making the jump height be based around for how long you held down the spacebar for more finetune control over your jumps.
Jumps to be kinda unforgiving if you slightly miss, like when you jump towards a platform and the character feet are a few pixels below ground level, it just blocks like a wall and you fall, some edge nudging would be nice.
I also saw that you have jump buffering and coyote time, but the coyote time is kinda OP rn because I can abuse it and still be able to use two jumps.
Pretty good job on the slopes, I know they are the vain of the existence to any game developer, they are still kinda wonky but they behave pretty good and don't make me slide and let me move up and down and jump which is all that counts. So good job on that.
Finally, this is personal suggestion, I think having a wall climb, kinda like Celeste does, could be super cool in the game.
Overall, nice game, nicely put together. If you plan on expanding this game, I can't wait to see what this game can become.