Ah, I see that is neat. Good to know you have it under control, as you say informing the player of this is tricky. I shall have to give it another go later.
I just uploaded a new version of the demo with Sinister pushed into the next episode, replaced by Móshì. Also added a bunch more small but hopefully non-intrusive hints to the first few chambers... things like explaining chamber skips, and that one can turn on a chamber timer.