Lifeline is a good extension to the vanilla State of Decay, but is unfortunately held back by its severe performance issues.
Forbes: When I reviewed State of Decay, Seattle-based Undead Labs’ unexpectedly compelling, and unexpectedly successful zombie apocalypse outpost management game, I noted that, although it was a compelling and very entertaining simulation of the terror and tedium of life after risen death, it was at times, I think it’s fair to say, a little glitchy.
Check out some video footage of Tony playing the DLC for State of Decay called Lifelife.
State of Decay: Lifeline, the latest DLC pack for Undead Labs' zombie apocalypse game, replaces the rural surroundings of Trumbull Valley with the urban sprawl of Danforth, and your team of civilian survivors with a crack military unit on a mission.