Great Game Again!
Nothing new as far as building stuff goes, but great additions in the sidequests! I'm rating this as a game add-on rather than a whole new game.
By the way, in the defensive missions don't forget to build a repair station. You can get away with less defense if you heal the object in between waves (and during assaults too). Another quick tip: Any level 1 structure can be recycled for the same price you built it for, so you can never build too many level 1 miners. Also, level 1 solar stations cost 200 and give 30%, level 2's cost 200 more and give 40% more, level 3's cost 200 more and only give 30% more again. It is a good strategy to build only level 2 solar collectors.