I don't knot if it's just me, but you might need a bit more on-boarding. I deployed, killed the enemies, killed what It think was their spawn base, mined the minerals, but then I wasn't sure what to do. I build 3 houses, but I don't know what they are for.
I think I'd need to get deeper in the game to evaluate the command center concept. I switched it during the mission, but I couldn't really do anything on the other computer because I didn't have more parts to make different builds.
It might be cool twist on tower defense, but I think you need the game to be a bit more cohesive and guide the player a bit at first.