I'd say up the playing space for the demo and give us the second resource to see what we do. Still gives us a taste but not so much of one we don't at some point go to the main version. I'd say between a 50% increase and a 100% increase in playing area (might be a tad overkill but it eliminates some of the "Just Out Of Reach" issues). As for the second resource thing it'd likely come with in some starting area going into 1 higher difficulty depending on spawn site but not sure on this one.
Other than that I'm good. Only nagging issue is AI ships and shipyard ships are generated with no power source of any kind even solar-panels. O_o That said the taste we got not is good but it feels too "Cut Off". Not sure how else to describe it.