The United States of Zombieland

The United States were infected with a zombie virus. The player's goal is to survive for 30 minutes by shooting all approaching zombies. With the usual two-stick-shooter style (one stick controls movement, the other aim direction), the player uses one of five weapons with limited ammo to kill everything which moves. Most zombies move towards the player and explode as soon as they touch, but other zombie types have ranged attacks. Sometimes extras (e.g. ammo, health or temporary weapon upgrades) spawn on the playfield and should be collected. The game ends when the player character loses all health.