I played until I got an error "TypeError: can't access property "mv3d_sprite", args.target is null", it was right at the beginning of the fourth set of puzzles, when Mokou and Keine travel after the old woman recognizes Mokou,
I accidentally talked to Keine while trying to push a boulder, and then hit "x" to try to skip it, but it burned her instead. Maybe resetting the level while in dialogue is what caused it or something, I don't know.
In any case, regardless of that, this is probably my favorite entry for the jam (from the one's I've tried, which is around half of them), very unique!
Really, good job with the game!