Hunted nightmare

The story is set in a world with cities surrounded by walls and fortresses with little to no communication with each other, no citizen can travel outside any of those cities for the unknown danger outside but, an unfortunate thing leading almost to the distruction of the city lead the citizens to evacuate, in the beginning of the story you would be choosing a character which would be responsible for your family safety and well-being and survive with them in this chaotic world, You could also choose to save only yourself though