"Shoot Em Up" Game

Are you for justice and always ready to take up arms to protect your world from the terrible creatures that are always coming at you? Then hit the start button and start moving through a huge abandoned city, where every building can be a refuge of vicious zombies. They will come at you from all directions, so be as careful as possible so they can't take you by surprise. Shoot in all directions and get a lot of points so that you don't run out of ammo. Do not let the monsters at a distance of a cannon shot to yourself, otherwise you won't get any mercy. Kill everyone who gets in your way and escape to continue the hunt.