After finishing campaign (it"s really done after the capture of 2 "enterprise" ?). And starting few challenge AND saw few opinions of games i ended to this results.
This game is what we can call a "city builder rogue-lite" , exactly like the game "Against the Storm". Where we got some boost for starting towns (like in campaign).
So you should know now what direction to take. Best is this one i think. Even in "Progression" or "Challenge Mode" you should put stuff like in campaign to boost our starts for towns :)
i'm not sure you can be a huge city-builder like some people think it is. Not like Cities XL in Cyberpunk mode ^^. But any game can become like this IF THE MAP is big enough :). i'm trying challenges now, but finished some "Titan" difficulty in campaign ^^.