There's so many second-rate zombie survival games throughout the world, it's not even funny. I'm surprised there isn't a parody called, like, ZombieZ: The Game.
Sometimes I like to believe that The War Z/Infestation is a parody of the genre, until I'm reminded that the game was produced by the same guy who made Big Rigs: Over the Road Racing.
I Made A Game With Zombies In It is a pretty good parody. It's a simple twin stick shooter in terms of gameplay, but it's absolutely bonkers and has a great song to go with the action.
