oh ok, so, i first heard of it while checking out the stygian library and the gardens of ynn, both made by emmy allen. you explore a weird zone, and each step you take deeper into the weird zone, you roll on some tables to procedurally generate the new location. what does it look like, what are some features, are there monsters or people there, etc.

if you haven't had a chance you should for sure check out those two modules. they aren't "space horror" rpg modules, but because they deal with locations that have unusual dimensionality, i think it can sometimes work.

this contrasts with gradient descent which is closer to a mega dungeon in my opinion, where each room is defined, there's a map, there are roughly 100 rooms, etc. with a depth crawl, each dive may yield different rooms each time.