The last level is honestly quite simple. Claim all of the planets and such on a single side. Send all units to the teleporter when you get maxed out. Teleport to middle. Rinse and repeat. Beat level 10 times.
All the other space games on steam are disappointing compared to this. Soft, simplistic artstyle with uncomplicated controls. All we need now are custom levels, a multiplayer, temporary alliances, and a waypoint system for reinforcing choke point planets.