This looks very, very good. Especially with the low walls. I like this idea that the Empire's trying to shut down the Alliance's production of provisions. There was a map like that in Galactic Battlegrounds, too, actually, except that then it was an Imperial planet with lots of agriculture that had been captured by the Alliance.
However, I'm wondering if you could perhaps experiment with different building colours, since this is not a desert map. I'm thinking it'd look better if they were white and grey, not brightly sand-coloured. It's looking good, I'm just throwing that suggestion out there.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.