The concept is interesting and I could see it being made into a cool and unqiue game, but right now the biggest issue by far is the lack of information in-game. You're not really told what the objective is or what you're supposed to be doing, you're not told what the buildings cost or what they do, it's not clear where you can place buildings or what orientation they must have (although that one's easy enough to figure out through trial and error) and so on. Before doing anything else I think you should think about including more information in the game, because it won't matter how much stuff you put in the game if the player doesn't know how to interact with it.
But again, it's a smart concept and I do think you could make something really fun out of it with some work.