The cover is fantastic. Great colours and composition.
I like the cosmic vibes. I hadn't thought to include pre-gens, which is a nice choice. I want to run that miner/rat catcher through the Ziggurat!
If I could offer one editing note: be wary of general adjectives of size (small/large), especially when it has already been established by other elements of the description, e.g. "Small hamlet with a small population of 200 people" = hamlet of 200 people.