looks funny
reduce the tiling of the ground texture, this will look better, when the stones are not so big.
a nice idea will be, add a second ground to the fort. you have it with the walksways on the walls, but work on some creative defending spots with the stuff you find in the editor. so defend the walls around is one point, and when the enemies inside, they must attack the second defendig floor^^
edit: cover on the streets/bridges needed