It would be cool to see some of the purchased upgrades at 10/25/50 etc actually make some physical changes to the army models. Such as more barrels on the machine gun turrets, add some rockets as well or something of that nature. Change what the catapults are flinging at the cube. As some examples.
Mining is way too slow. Also would be nice to be able to control what swords the blacksmith makes, as I have quite a surplus of wood and the first ore. But, don't want the blacksmith using any of the metals I am saving for the next building.
Fun game. Biggest complaint other than those already stated is that money earned/completion doesnt scale enough with the levels, for the increasing cost of upgrades. Leads to way too much grinding just to progress.
Great Graphics, except for the final cutscene. Looked like something a jr high graphics designer would make using basic CAD. Other than that very enjoyable. Great Job.