It came from space, and ate our brains

Your name is Jerry, you're balding, and you know how to handle a gun. You somehow managed to survive the invasion of a merciless alien species, the kind that feeds on human brain. Things look bad when you wander the city, looking for gear and weapons to survive, as pink light emitting aliens try to corner you. You realize there is only one thing left to do: set a new high score and die like a badass.