For those of you who are wondering if this is worth playing...
You can't have more than 1 girl pregnant at the same time. I have no idea why the devs came up with this limitation (especially since the best ships can be commanded only by royality and they takes years to create), but that's how it is.
You also can't invade any system you want. To invade a satellite or a planet in a given system, you, or any of your allies, need to own a planet in the system first. This is actually pretty annoying, because you're the only one limited like that. Non-player forces can attack you out of nowhere even in a system you fully control, which sucks. And when you get to the point that there is only one alliance opposing you, you need to enter it under disadvantageous conditions just to play political games with them for many years to acquire a planet outside of your systems, so you can start your conquest again.
There is also quite lot of events where you or your lovers end up being assassinated or die of an incurable disease. And by the way, those assassinations happen even if you don't attack anyone and have best relationship possible with all other rulers.
You also can't survive in this game without constant fighting. You either enter an alliance and will be demanded to attack your enemies (which you can technically refuse, but it causes troubles for you later), or you try to survive on your own and kiss ass everyone around you, which can work for a while, but even if everybody loves you, they attack you eventually just for you not to get bored or something and totaly hate you for destroying their ships when defending yourself.
I could say more, but I think it's enough. I mean, it's definitely a well made game with a lot of story and options, but also with a lot of bullshits which made me quit it quite near the end.