30 levels later and I beat the game.... Its a great TD but fairly easy once you get the hang of it. Basically, the winning strategy for me was to save for First explosive guy, then spam Airlift for him. Keeping buying the $600 one and then u cannot lose, the money just rolls in.
 "Mud and Blood 2"){kind=icon}
 "Nano War"){kind=icon}
 "Lockdown Tower Defense"){kind=icon}