Davoss: A Setting for Abstract Dungeon

From publisher blurb:

Ten years ago, extraterrestrials devastated Earth. While they remained in space, the aliens established flying cities called Davosses from which their human collaborators rule the common people and do the aliens’ dirty work. While most aliens crushed all major powers, isolated groups of rebels continue to fight back.

Davoss is post-apoaclyptic alien-invasion setting for the Abstract Dungeon roleplaying game. It includes

A history of the setting
Details about the world today,
New traits
New foes
Optional setting rules
A complete adventure to start the rebels on their path to defeat their alien overlords.