The group must maintain its refuge while preparing to abandon it before the undead break through.
A shelter in Into the Dead: Our Darkest Days is a temporary address. The group can improve it and reinforce its barriers, but the developer’s premise requires movement between refuges as the undead press further into the city. The official Into the Dead: Our Darkest Days description.

The fictional Walton City lies on the Texas coast in 1980. A heatwave and an economic crisis precede the outbreak. With outside assistance cut off, the survivors’ larger objective is to leave the city rather than establish a permanent stronghold.

That makes each scavenging trip part of two plans: sustaining the current group and preparing its next move. Supplies support food, tools, weapons, and shelter improvements. Hunger, exhaustion, injuries, and distress are tracked as conditions affecting the fictional survivors.
Nightly attacks put pressure on the barricades. Beyond the shelter, encounters can involve other people as well as zombies, with decisions about recruitment, avoidance, and confrontation. The side-scrolling game joins those journeys to the continuing work of keeping a group together between departures. The official Into the Dead: Our Darkest Days description.

