The video with more explanation has since been removed by the developer.
Though there is no real objective except surviving at this moment, the developers promised a dynamic storyline in the Kickstarter and stretch goals.
The player is a survivor of the war who must survive by finding shelter, food and water, as well as scavenging supplies to fend off the numerous zombies (hinted to be the consequence of nuclear fallout) that populate Navezgane. The game's events happen during aftermath of a nuclear Third World War that destroyed an extremely large part of the world, except for some areas such as the fictional county of Navezgane, Arizona.