OH NO THE ZOMBIES WILL NEVER BE ABLE TO DIGEST THE BRAINS WITHOUT THERE LIVER!!!!!!!!! poor zombies.
The zombies don't go for the brains, they just sort of attack however they can and eat anything they can get at. After a few hours their liver goes through another growth, developing spikes and eventually something resembling lobster claws, at which point they start eating on their own and continue to grow and develope. Enough of that and they just jump free of the body entirely, in a hard shelled form, leaving the zombie hucks behind.
That doesn't really become important until later on. The things that the players meet in the first game are the fresh, distended zombies.
The idea is to tip the supernatural early but to throw them with the wrong conceptions. They start thinking it's a zombie game but later these lobster things are running around, there's a priest preaching in the laundromat at midnight, and a guy with pointed ears and white eyes is talking about rituals that sound more like sex acts than magic.