This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / The Breach
The game is billed as your standard Zombie Survival game, but that's kinda selling it short. Your standard mooks are Zombies, yes, but quickly diversify to hideously mutated creatures created by "The Yellow,"
The visuals include a man with a flayed skull and a tumor growing out of the back of his head, a hunchback with glassy eyes who constantly vomited blood, and a woman appeared to have tumors for breasts and a head growing out of her groin, all of them with horribly jaundiced skin.