Shooter/zombie crossover idea.
So WW3 breaks out in 1985, and the player is an American or soviet soldier. In the aftermath of the nukes flying, there is a breakdown of society to the lowest level, and then the radiated dead rise.
Soviets and Americans team up and fight through a post apoclaitic hellscape. West Germany is laced not only with wandering irradiated hordes, but also nuclear radiation, chemical weapons, and bio weapons.
To make the game more interesting, there is a set limited amount of ammo, and fuel, and the player must complete all objectives before these resources run out.
Not only does our protagonist face zombies and a post war hellscape, but roving bands of other soldiers-called "ghost riders"-not actually ghosts but former comrades, enemies and armed civilians, that are pretty much fighting for the last scrape of food and water, and fuel.
The game will emphasize the themes of the inevitability of death, hard choices for survival, (players will be forced to commit atrocious acts just for more ammo), and will try to reach a safe zone. Only to find they are themselves poisoned by radiation and they end up dying anyway.
Game goes to black.
Could be lackluster or good be amazing.