A very nice game!
I think this might be the first defence game I've played where you were able to defend yourself with an actual character. Defense games can be annoying when it's just not you controlling it. It might not be much, but it's still a really cool feature. The music here is also great and gives you a wonderful sense of being in a technological world. The best thing is probably how good the graphics are. The towers themselves look great when seen from the standard aerial view.
Even the monsters are very nicely designed, with a lot of effort being put into making them look unique. It's nice to see a lot of strategy game combined with a defense one. I'm normally not a fan of strategy games, but anything goes well with defense games. I appreciate how cool it is when seeing the monsters die. This was a good unique experience.