Maybe i played too much Traveller or watched too much Firefly but the limitations on how much surface area you can use annoys me.
How come we can't use Moons? Earth has (by this scale) a class 2 moon. We may not be able to use jupiter but is has a load of moons we can. What about Asteroid fields? Right now they appear as an anomoly that you explore once and they go away.
Stuff that is orbital shouldn't use any pf pur precious surface areas at all. It should get an orbital box. Trade goods - like diplomatic translators should not use any surface area either.
There is a military governor screen that lets us change or upgrade ships. Why is there no screen to upgrade our planets? When we improve (farms for example) we have to go into EACH planet, bulldoze the old farm, and rebuild the new farm. If a planet hasn't finished the old farm we told it to build, it automaticallyy upgrades to the new farm. So why don't completed farms upgrade?
Terraforming should work differently than it does. Is we really wanted to settle Mars, we could pack a lot more onto it than the four squares the current system allows. If Mercury had heavy metals on it, we would find some way to get them - not just leave it as a level zero rock.
Okay, I'm done. As great as the game is, it has room to improve.