I think there should be only one exit. The level that contains the exit must have only one way to enter, to actually make it hard. It could be Level 3999, Level 92233… or any other that isn't a trap or the Main Nine.
I'm not really a fan of no-clipping becoming an ability, imo it should be unexpected.
I'd enjoy the idea of an extradimensional being, as much as it would be a bit hard to define it; maybe something like the One-Above-All would be cool.
Yeah, the goal here is to just throw a bunch of theories and headcanons onto paper, and then compromise and combine them all to make one massive mix of all of our theories to be our canon
Even though The Kauer Thesis was more for expanding the lore of Kauer, it’s my actual headcanon surrounding the Backrooms. My viewpoint about the creation of the Backrooms is explained there.