If I could suggest a support for next game - maybe something to attract your zombies to a specific place. I've been frustrated more than once by my invincible horde of zombies just milling around on one side of the screen until they all die rather than taking out the soldiers on the other side!
 "Rogue Fable III")
 "Infectonator 2")
 "Monster Bark"){kind=icon}
 "Orbital Onslaught")
 "The Legend of the Golden Robot")