One of the better defence games i've played, probably because it doesn't feel like one most of the time with all the attacking options you have. I love the graphical style and the animation in game and out is great. I like the fact that you have a limit to spending so you can't super-max everything
I agree with a previous poster that additional scenes between each zone/boss would help set the scene and flesh out the story a bit.
Whilst I don't disapprove of fanservice in general, i feel it detracts from this game. The main character is well draw and cute, feisty and sexy enough without the upskirt. However if she was to star in a spinoff game I wouldn't complain ;)