After a bevy of invasions and attacks I can say that defense still needs a bit more work.
Since invasions cause a massive penalty to happiness while the invasion timer counts down, even a small force that is going to die, can keep you in perpetual invasion until your citizens riot and you lose the planet. IMO this is a weakness of the system, and I am not entirely sure there should be a penalty to happiness without some other balancing factor.
Second, because of the above perpetual invasions, the defender doesn’t have enough time to recoup at all. I believe there should be some kind of cool down between invasions. At least 50% of the time it took to do the invasion, if not longer.
Lastly, and this especially, ORBITALS ARE TOTAL SHIT, I am being blunt here, because they lack any punch, any bite. I have a guy sending in scouts that aren’t even getting killed, then invading,the leaving before his full fleet gets hit by the Orbitals. I have some solutions I will present:
Decrease the damage of Orbitals further, and make them fire every 20 seconds. I would say 20 damage for Small, 30 for T2, and 35 for T3. Then make the invasion force sit there for at least 5 minutes while dropping “drop pods.” This means full fleets will be battered when launching, and if they don’t have enough armor they will be killed before the invasion begins.
Have your ODS check how many ships there are: If there is 1 to 4 ships, the ODS should fire rapidly at a smaller damage WITHOUT refreshing. If there are 5 or more ships the ODS fires likes normal with refreshes.
AI targeting should be set to Ships with troops on board > Ships that can bombard > Ships that have weapons (total weapon damage for fleet) > everything else
Both of these solutions eliminate scouts using up your ODS. Also it means that you are going to take some damage for your efforts, instead of sailing in without any damage at all.