Really like your core game idea here, good job!
One thing I would say is that the platforms require really precise controls to land on since they are spaced in such a way that there's only one height you can land on them at. It can get quite frustrating at the part where you need to jump up a few in some stairs as there's so little margin for error. I'd recommend either making the jump force a little higher, or just moving the platforms around a bit to make it more forgiving.
But nice job overall, it's a fun little game.