In short, Star Wars Supremacy (known in the US as Star Wars Rebellion, for some reason) is a polished DirectXbased Windows 95 game with neat graphics, competent sound effects (including voice messages), some utterly predictable gameplay and a creaking interface. They'd already got a Star Wars 'universe', so all they had to do was throw in some strategy and a 3D tactical war-gaming engine, and before you could mutter 'seduced by the Dark Side' they were beta-testing Star Wars Supremacy.
The Moderate Success Of Space conquest games like Stars! was an obvious opening for LucasArts.