The game is really fun! A very simple concept, but I think some instruction would be really helpful. At first, I was confused on what was happening, I thought I was just playing a stationary tower defense game kinda thing. I realized halfway through that one of the towers I wasn't controlling and I was supposed to be attacking them, and by then I had picked enough upgrades that it was too hard to defeat the ai. I enjoyed it overall, and it's a nice concept. Nice work!