Interesting idea, but the blocks might be a bit too unhelpful at times (maybe I'm just not good at it?), and there were times when it seemed like I should be able to jump but couldn't for some reason.
Oh, no, they're super unhelpful. Usually if you can't jump it's because the collisions are super strict to keep all those objects from glitching out. Could be fixed, of course, but not by me in a weekend on Pico8.