Zero City
Mobile game opener. 

Zero City is an online simulator game that features a refuge populated with survivors. Your goal is to create the mightiest squad, develop your base, and raise up new survivors to oppose other players and various infected mobs that inhabit nearby areas.

Genre: Simulator; Strategy; Role-playing
Platforms: Android, iOS
Type: Free2Play
Areas: Worldwide
https://beingame-mobile.com/