There's a bug on Army gain 1.5x, IV era techs. It shows 2.0Mi, buts i believe its acctualy 2.5Mi
Take a look there.
Great game. It would be cool if you could enter and construct in each conquered area. Also consider building more world or areas to conquer. You could add a way that we can chose where we gonna put those buildings and areas that each building gains some sort of bonus.
The buildings should not be destroyed every time, you construct one time, and then you can upgrade be there.
Again, great game, love it