From the Steam Store page:
It's been a few years since the zombpocalypse turned the world's cities into graveyards and sent the few survivors into hiding. Now you must gather them up and restore civilization to a ruined city, one building at a time.

Rebuild 3 is a strategy sim game with a good helping of narrative and dark humor. It's a thoughtful game that'll make you fond of your survivors before you send them to their deaths for the greater good. As you expand your fort to new buildings, you'll decide between farms or fortifications, housing or hospitals, and make tough decisions to fend off raiders, illness, starvation, and madness. And the dead are still out there wandering the streets, hungrier than ever.

Rebuild 3: Gangs of Deadsville is the third of my Rebuild series, and the first one available on Steam. It's a totally new, much bigger game than the first two.