First of all, I think this game is excellent. The innovation in shifting competition away from combat and toward free trade using actual market forces is incredibly refreshing. It's also executed almost perfectly.
I say almost, because there's one small (potential) oversight that I noticed on my first full game. The offworld market is the obvious end game, but before building the market itself you can't view the prices of the goods you're going to sell. I personally think this is an oversight in that it either forces the player to maintain an even and diverse economy or gamble and select a resource type to focus on with the chance of it being near worthless in the offworld market.
I'll admit, I've played all of the tutorial plus one full game (which I won), so I'm hardly an expert. However, I think the game would benefit from a deeper level of strategy if prices in the offworld market were either known or could become known earlier in the game.