looks quite fun to play, but you will eventually strain your back after leaning over so much.
seems like a bit of a health hazard to me, because while your moving around the table or desk to get to the other elevation of the city/map, concentrating on the screen you could trip or slip over by not looking where you are going.
apart from the above problems, looks quite good. a good idea, of course it needs developing so that more games can be played and more functions added to the device.