Perfect submission, I've really liked that. But I think I'm gonna argue about the choice of making the movement less familiar to the genre in order to make it speedrunnable. For reaching a lot of velocity you should probably add another elements to the game, maybe dashes that accelerates the player, bunnyhop, moving platforms that add velocity, etc. One thing that felt very odd to me was the wall jump not impulsioning you to the other direction, that allows corner jumps but makes climbing harder, I think a solution for this is adding a grab button just like Celeste, this allows corner jumps while still making wall jumps familiar.
Overall, one of the best submissions of the game jam, the visual and the audio are amazing too!