Well, this was intense. There were some pretty clever puzzles there! I don't think anything strictly requires two-player (even what I assume is the trick to Time It Just Right), but it helps, especially if you're not good at jumping and quickly Unmaking at the peak of the jump.
I should note that when playing this "locked," there's an invisible wall a few screens in due to a bug that currently exists in v1.07, so I'll fix that. As well as some wonkiness with the Armors.