Think less "town" and more "cave". Spaces created by natural processes also lack any feeling of purposeful design, but still have lots of interesting variation

Think less "town" and more "cave". Spaces created by natural processes also lack any feeling of purposeful design, but still have lots of interesting variation. The feeling of exploring an untamed natural space (which even the creator of the game hasn't seen before!) is part of what makes these games fun, I think.