While I was initially super confused, after coming back to it and figuring out that I could jump, this is really really clever! The concept has so many applications, and the little bits of text seem to tie together a narrative as well as give hints to the player on what they need to do. The last level is definitely way harder than everything else, and I mostly attribute this to the fact that it required a kind of clunky jump while the gravity was reversed (I'm not used to jump being bound right below the wasd keys). With some more tuning on the level design and polish in terms of sound and animation, this is a great puzzle game that really messes with your head, great job!
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I guess so many of the games I've made, played, and seen videos of are platformers, so I just sort of took jumping for granted.
The intended control scheme is arrow keys + Z (which is what most platformers I've played on keyboard use), or WASD + J (which IIRC is what the Distorted Travesty series uses, which is the only non-jam platformer I've played that uses WASD). (This says arrows + ZXC has been standard since Cave Story.) I've gotten at least one other comment on a different game about Z to jump; is it really that uncommon or is it just people not used to 2D platformers on PC?
(Oh, and also I'll almost certainly make a post-jam update that adds remappable controls. I've already written code to do that; only reason I didn't include it was because I didn't want to include too much code written before the jam.)