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Damn, I didn't even think about the costs of the refinery. Although there is the cost of A) Time and B) Energy spent building it, energy being a...
I've beaten Hard campaign, and 100% Random, no Outposts 1,2,3 on Easy. Tried to do 4 ... and then had THREE destroyer waves spawn in a row....
I gotta tell ya, I didn't know WHAT in-game upgrades did health/damage wise until you said it (the icon is not obvious). Sure, I had assumptions...