Last week, Burn, Zombie, Burn! came to the PlayStation Network. If you didn't pick it up or scope IGN's review, the gist is that you're one man against an army of the undead. You scoot across colorful levels blasting cutie-pie zombies to bits and having a cartoony time.
Zombie Apocalypse is like that -- except it ditches the cuddly undead for grotesque roamers, tosses in some filthy environments and gives you that Left 4 Dead "all hope is lost" vibe.