What are some good, more casual zombie games?

I do like Left 4 dead, Dead Frontier, and Nazi zombies on the call of duty games, but I enjoy the more casual zombie games waaay more. I rather the ones where you can relax a bit while you play and actually have some fun, not if you take your hand away from the controller/keyboard for half a second your screwed. So I'm looking for a more casual zombie game I haven't played. Ones I can remember playing are: Rebuild (the flash game on kongregate), Dead Rising, Plants vs zombies, and Stubz the zombie(LOVE THAT GAME!). Please suggest as many actually good ones as you can. I need to kill some zombies/eat some humans while relaxing a but at the very least. Thank you fellow zombie killers/brain eaters!