Survivalist: Invisible Strain

Survivalist: Invisible Strain is an open-world colony-building sim set in the zombie apocalypse, often compared to State of Decay, Project Zomboid, Rimworld, Kenshi, or "The Sims but with zombies".  It focuses on characters and relationships as well as survival.

You can talk to anyone...

All living characters in the world have names and personalities. They remember your actions, and their memories affect their mood and their opinion of you. They have their own lives: gossiping, eating, sleeping, keeping warm, working and fighting. Some will give you quests; it's up to you how or whether to complete them. Use negotiation, friendship, violence, stealth or trickery to achieve your objectives!