I love tower defense games, and this is a great twist! The visual design and simple UI immediately drew me in. However, I was confused for about 5 minutes wondering how the core gameplay was supposed to work. The reason for this is that in the tutorial, when placing your prisms, the game does not force you to place them in the indicated boxes. I placed my towers in a more traditional tower defense location, and had no idea the enemies needed to walk THROUGH the lines to get lit on fire.
I would also appreciate being able to see the node's range while I'm placing prisms, with confirmation about whether they'll be powered or not.
I enjoy the speedboost mechanic, it gives me something to do while I'm waiting for more money!
So far my high score is 212, but I hope to keep playing :D