Hi! I'm searching the title of a game (in fact there was also a #2)
RTS, you had to conquer planets, by just drag and drop between the planets, and the vessels moved&combat auto. The more you got planets the more you produced (auto) vessels.
In the first game is was 1vs1 (PVE only), in the second it was 1 vs up to 4 opponents. Near the end of the game 1 opponent was a kind of black matter moving faster than regular opponents.
Something like 20 levels. Simple design, very smooth gameplay
I would say it's +10 years old
Immediately made me think of Phage Wars (of which there are also two), and in the comment section I saw Solarmax and Solarmax 2 mentioned as being basically the same but in space.