Amazing game. The best TD I have played in awhile. The music is great, not at all repetitive, even though it loops. The graphics are even better. Well done sir. Well done.
To everyone who who said this is hard, you just have to use strategy. If it's weak to frost cannon, use a frost cannon, if it's weak to heat missiles, use heat missiles. It's not that complicated. However, it's all about the placement. you have to put towers where they are needed, not half way across the map.