wait til you get to the army/military age and max out your towers then put the double turrent on all of them and itll last you wont need to buy any soldiers until your earn enough for atleast 4 super soldiers and then if you played it out well you win
 "Interactive Buddy"){kind=icon}
 "Earn to Die"){kind=icon}
 "Eternal Red"){kind=icon}
 "Age of War"){kind=icon}
 "The Sandbox"){kind=icon}