StormBASIC Games has ZombieHunter [7DA] (iTunes Link) in the iTunes App Store for FREE for a limited time.

Only Seven Days to the coming of the Apocalypse!
An unknown virus called the S-Virus is killing the human population and turning survivors into carnivorous zombies…could there be any other kind of zombie?!

Humankind has just one hope for the future-Dr. Kayla Cupper. Dr. Cupper has discovered the source of the infection, but she needs time. Your mission is to protect her, while she develops & synthesizes a cure to contain the virus.