The artwork is beautiful, simple yet vibrant! I see in the comments that you've some problems with the AI, nevertheless I tried around the hotseat and I think it might be a great hit if it has online option.
In my opinion, camera movement needs some change. I think it could be more intuitive and easy to learn by orbiting the camera around with the mouse (right mouse pressed for example), and changing levels with the mouse wheel, perfect for mouse only gameplay.