I love the main concept, but whoah that’s a challenging game right form the start! :)
Are you using the Platform behaviour on the player? Because if you are, I think using the standard jump via “simulate control” (with a non-zero jump sustain value of course) would be a bit more intuitive. I found the current “release space bar to jump, hold longer to jump higher”-controls a little unintuitive, although it’s definitely an interesting way to control the character.