The "yes it's one way collision" flag literally told me the moment I had that realization. It was wonderful design to put that fifth platform just reachable from the third. The tenth platform specifically doesn't have one-way collision; that was probably on purpose because it looked like it needed to in order to boost correctly I think?
I like how you thought the time running out gimmick was too generic and you added more to it, because I've been playing way too many time running out games recently
Also sorry for the double comment