An endless mode with constantly respawning asteroids as a test of how long you can survive would be a nice feature, but other than that, it's a great game for what it is.
1. Income does nothing, apparently. Fix this.
2. If they're Nazis, then what's up with Austria-Hungray? They dissolved after World War 1, which was before the Nazis even existed.
It has potential, but there are just a few things that should be fixed.
 "Upgradaroids"){kind=icon}
 "Press X To Jason"){kind=icon}
 "Nuclear Plant"){kind=icon}
 "My \"Dear\" Boss"){kind=icon}
 "Gaza Defence Force"){kind=icon}
 "Bug War Recolonize"){kind=icon}
 "Soviet Conquest"){kind=icon}
 "Upgrade Complete 2"){kind=icon}
 "Great Game 1/5"){kind=icon}
 "Butterfly fantasy"){kind=icon}
 "The Torture Game 2"){kind=icon}
 "Ghandi Dodger"){kind=icon}
 "Perfect Wedding Look"){kind=icon}
 "Don't Call Him Fat"){kind=icon}
 "Ginger Extermination"){kind=icon}
 "Chat"){kind=icon}
 "Rush For First Date"){kind=icon}
 "Twilight Kisses"){kind=icon}
 "alien exterminator"){kind=icon}