A good game for people who want a tower defense but don't like to stand around for minutes at a time doing nothing while their towers do all the dirty work. Very solid overall.
Also, I can't believe the general doesn't get fired after losing half the world to the aliens. I know it's better this way so the enemies have a more defined identity and to save money and time on voice acting, but it sticks out a lot to me that he loses every single battle yet still keeps his position, not to mention every single nation on the world trusts him blindly as well. He really has the hearts and minds of the people backing him up.