If you liked this
Games like AI War 2: Zenith Onslaught
If you finished AI War 2: Zenith Onslaught, the closest matches are Hardspace: Shipbreaker, Planetbase, Ashes of the Singularity, Cosmoteer: Starship Architect & Commander and Bronze Age. All 9 share its indie genre and are ranked by how closely their themes and modes overlap.
