I haz a idear, for increased playability a survival mode could be added, and in both normal mode and survival turrets, additional buildings (that unlock various tech and somesuch) can be built with money, maybe even a barracks to employ those other 25000 survivors!
 "Nuclear Plant"){kind=icon}
 "This Ain't Sparta!"){kind=icon}
 "The Idle RPG"){kind=icon}
 "SteamBirds"){kind=icon}