been done before many times over,.. but...
... this is well put together from what I can see, visuals need more work but it's looking pretty good so far graphics wise. a little less orange wouldn't go a miss though. the main game mechanics have been done so many times over already, and the major titles that revolve around this 'hold off the hoard' style game have done it to death and have done it well. Personally I'd work on changing this game so it's 'different' from the rest, instead of just directly copying others games.