Zombie Crisis 3D

Zombie Crisis is an intense, 3D rail shooting game for the iPhone/iPod Touch and ready for Mac NOW!
Until House of the Dead come over to the iPhone, you can indulge your zombie-killing tendencies with Zombie Crisis 3D.

It plays out like an arcade light gun game; you have zero control over the movement of your hero.
All you do is point and shoot. This lack of "control" doesn't upset me too much, as I have a real fondness for light gun games and Zombie Crisis 3D does a good job replicating that arcade experience.