Zombie Siege

Zombie Siege is a survival shooter with an escort mission built into its heart, and that changes it considerably. You are the last line of defence in a fallen city, firing automatically whenever zombies come into range so your attention stays on movement. What you are moving toward is trapped survivors, and rescuing them builds a squad with defined roles — a shield tank up front, a sharpshooter at your side, a medic in the back — who then have to be escorted to the safe zone rather than simply collected. Kills drop medkits and bombs and bosses drop permanent upgrades, so pushing through the mutant hordes and towering zombie kings pays forward into later runs.