Well ill admit, the first thing i was disappointed in were the lack of new units. Sure the defensive upgrades are nice, but i'd like a few more units to play with.

But on to what i gathered from just one game-

Mines- Limit these to 25 per grav well with an increase in +5 per defense upgrade. This way you can have a resonable amount of mines, and if you dont own that grav well theres a limit. Mine layers need to spawn from shipyards with the autocast ability off. After taking a planet construction ships should beable to disarm or convert mines to your side.

Starbases- Wellllllllllllllllll improve them a bit more at first build, and lessen the upgrade amounts.