I don't really play tower defense games but I liked this game! The graphics are nice, the gameplay is simple and overall I enjoyed it. I also really like the color changing mechanic.
During my first game, I was completely caught off guard by the purple one and I think I lost around 40 HP because of it. I was going to keep playing after that but when I tried to place a cannon the game stopped registering mouse clicks because of some kind of glitch so I had to reset the game...