This is a fun tower defense game with a cute artstyle! It was very satisfying to place my towers along the path, it was a sort of zen experience. I notice that placing three towers of the same type next to each other combines them, which I assume upgrades them but I'm not sure. I appreciate that you guys had time to make 3 different difficulties/maps!
One thing that confused me is that there does not seem to be a way to win. Eventually, the waves stop coming, and I assume that means I won, but it doesn't feel much like a victory. Having a sound effect or a "You Win!" screen really goes a long way.