I discovered this game Neptunes Pride last week. Very much enjoying its slow paced strategy gameplay.
It's a free to play, HTML 5 game so it works on any device.
You capture stars, develop your economy and technology, and send fleets across space in real time. Diplomacy, alliances and betrayal matter just as much as military strength.

If it sounds like your type of thing, give it a shot.

https://np.ironhelmet.com