AMAZING GAME!
It just needs a way-point ability that will attract your zombies. Like how you can buy bombs, and acid. You should be able to buy a klaxon siren that will attract your zombies to it.
I'm expecting a third game btw... and I'll will not be disappointed.
Enemy officer: Captain! We found an Imperial planet that has been wiped of life. What should we do?
Enemy captain: SEND IN TANKS!!!
Enemy officer: But sir, we have airships... Shouldn't we use those?
Enemy captain:Nonsense! Just place them in the middle of the field a few miles away from the missile silos. We've got extra fuel anyways.
Enemy officer: ..... yessir...
 "Infectonator 2"){kind=icon}
 "Top Defense"){kind=icon}
 "Warzone Castle Defence"){kind=icon}
 "The Heist"){kind=icon}
 "Hell Tour"){kind=icon}
 "Infectonator!"){kind=icon}
 "Gravity Mouse 2"){kind=icon}
 "Undead Hunter"){kind=icon}
 "Retardo and the Iron Golem"){kind=icon}
 "Papa's Pizzeria"){kind=icon}
 "Color Infection 2"){kind=icon}
 "Huje Tower"){kind=icon}
 "Little Wheel"){kind=icon}
 "Seed of Destruction"){kind=icon}
 "CycloManiacs"){kind=icon}
 "Randomo"){kind=icon}
 "Boxhead: The Zombie Wars"){kind=icon}
 "Stick Arena: Ballistick"){kind=icon}
 "Pirate Defense"){kind=icon}
 "A Small Favor"){kind=icon}