Grey Phobia is a third-person action game set in a zombie apocalypse scenario. Players control the survivor who must navigate through various scenes, facing hordes of enemies using a variety of weapons. The game's mechanics are straightforward, with a fixed camera angle positioned behind the character, allowing movement only forward and sideways.

Players have access to weapons like machetes, machine guns, and shotguns to eliminate zombies efficiently. Progressing through the game enables upgrading the character's attributes such as armor, health, and speed, enhancing gameplay experience. The game's black and white comic aesthetic blends seamlessly with its captivating graphics, making Grey Phobia an entertaining and visually appealing action experience.