This was a nice clicker/builder game. I had trouble at first, but that was with the web player. After I downloaded the game, it was a smooth experience for the most part. Once you get closer to endgame, it becomes more tedious to manage everything, and I didn't have anything to do but wait while the final towers were building, but I guess that's more a symptom of the genre itself. But I definitely had fun maxing out my resources and defenses. The controls were pretty good, only thing I can suggest is to add a way to recenter the camera on the crystal.