No revenue estimate for XBOX — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $3.8M — a different platform, not this one.

Forever Skies

Forever Skies is a first-person post-apocalyptic survival game. Play it solo or in coop and return to Earth, ravaged by an ecological disaster. Build, fly, upgrade and customize your high-tech airship. Craft tools, and scavenge resources to survive. Face dangers on the surface and hunt for viruses to cure a mysterious illness.