very boring.
The presentation is decent enough, the graphics and animations are fine. The music is nice, though a really weird choice for a game like this.
But the gameplay is very boring. TD games aren't the most spectacular genre to begin with, with a lot of sitting around waiting while your defenses do the work (and I play games to prevent sitting around, doing nothing). So when you make a defense game you need something to make the phases where the waves come either more interesting or a lot faster. The reinforcements and taking control of a squad don't really cut it for making these phases more fun, since both aren't really needed.