Just a short update: Retro Commander will come out of ALPHA/BETA testing on November 25, 2023. We are currently doing bugfixing, balancing and other tweaking until then. The official campaign and official skirmish maps are ready, but are also currently getting an overhaul.
That said, we will continue working on the game after the release. Depending on how it all goes, we are planning to add an Alien faction. It's currently in planning.