I enjoyed the game, I was not prepared for circles after the artwork already given, but I really liked the towers. It felt like there was not enough currency given for each kill. I often got away with the same exact set up (two towers left and right, and a third at the bottom), only time I changed that was with the heavy towers, and even then it was to the left and right. I think that would improve with more enemy types and reason to put towers further from the source. Overall good concept!