Collapsing Worlds is sort of an "out there" canon. This canon focuses on the more "unstable" parts of levels, and how many timelines and universes are affected by them.
All "canons" are technically canon to this, due to an effect called Non-Euclidean Gravity.
Non-Euclidean Gravity
A phenomenon where non-euclidean infinite spaces draw traveling objects to a certain area, via looping areas and changing structure. This effect varies in strength, from laughably easy to escape, to being literally impossible to leave. Various areas affected by non-euclidean gravity are part of different canons.
The general tone of the canon is focused around chaos, change, and surrealism. Thus, the pages are more "weirdcore" than liminal, though the liminal feel is still allowed. Go all out with your strange ideas, weird tales, and format screws.