I was wondering, if SOASE had Land Based Combat. Like in Star Wars Empire at War or planterary invasion like Galactic Civilizations you can do that. While fighting the enemy in space, you can pause and focus on the land battle or both .So here is what i think.
Colony ships can be upgraded with assault pods to send troops along with colonists to go to the planet. Your Colony Battleships can send vehicles.
Land Based Abilities and Orbital Bombardment. Each side gets new abilities and one unique abilities. Normal abilities are Invasion and Bombardment
Tractor Beams: Attach these on Krosov(can only tractor 5 asteroids) and Marza(can tractor 15) and bombard with asteroids causing planet damge
Robotic Soldiers: Send Robotic Soldiers along with Human Soldiers to invade.
Join the Advent
Infiltratos promising them a better life under our rule, unhappy citizens are likely to join our side. Must have allegiance at 50 percent.
Planet Tremor: By scattering gravity-altering satellites into orbit around inhabited planets, we'll be able to cause earthquakes. May reduce life and irreplaceable planet damage.
Gas Warfare; Viral Clouds are release on enemies reducing defensive strength but may cause irreversible organic life damage meaning less population less health and maybe even changing the planet.
Massarce: Kill all populace and send broadcast to enemy. May cause rebellions
What do think, should it be RTS style or Turn based