I think I played a demo of this.
Think Age of Empires II meets Star Wars
If it is the one I remember it was based on the Age of Empires II engine and had lots of battles on different planets with star wars themed units and buildings. I think there were diffent scenarios based on the Episode IV-VI films and probably a random map scenario as well.
They may have even even released a follow up.
The demo was pretty good
It has been out quite a long time now, probably quite cheap now, if you can find it.