Fun! I spent enough time with it to get at least sub 10s on each level.
Lvl 2 was the toughest to do this with, I think the normal path is faster than the harder one. Also through doing this I've come to realize there's much oddness about the wall-jumping. Learning to use the gravity mechanics well actually helped me finish my goal.
That being said, love a platformer, especially a momentum based one. Good job!