The algorithm for the proc-gen is super simple - like a dozen lines of code. (And, I think, it's kind of broken)
But it kind of works because of the bombs because when it create a broken level you can bomb it into compliance :)

Glad you are enjoying it. I discovered you can bomb yourself out of the cave if you mash the button enough and fall through the endless grey nothing until you die. That's probably a metaphor for something.