Overall this is one of the greatest and adicting expansion, great awsome job devs of IronClad. However there are few problems with it that need to be fixed.
#1 Starbases: they are the best things that were put in however, the constructors for them are a little to cheap, cheaper than a capito ship and the constructors themselves are built to quickly, 17 secs is way to fast. Their upgrades need to be cheapen and I think there should be 10 upgrades on them instead of eight, another thing the ranges on them need to increase by alot, there pathetic to the gravity whell. Also has anoby thought of putin anit-fighter/bomber weaponry on a starbase they have the space to have them, a lot of other games have them.
#2 Mines: Awsome but can be spamish, there damage done needs to decrease, also there needs to be a limit on mines per gravity whell like 800 mines. Scouts need better visualization range of mines to disingage them and need to be faster, perhaps you make the flak frigates also aniti mine weaponry to destroy them faster othery wise it takes a lot of scout to much micro managing. You could make a whole new design for a strong shielded and stong armor plus weak weapon strength just for destoying mines, it make our extreme micromanaging a lot easier to do.
#3 Capitol Ships: There extremely weak against bombers, In a lot of other games they have anti-fighter/bomber turrets that destroys them, maybe you could modify them to have like two of those, especialy the carrier they have them because they targeted more often then not, so they have like three of them.
Tese are my thoughts and words of my advice,