Wonderful game, until the glitches take over. ;_;
This is an intriguing defense game which brings some new features to the table. The story is a little preachy, with the Federation obviously meant to represent America. The veil is so thin that they start openly referring to Guantanamo in some of the later story segments. It is amusing in places, though, and I liked how Steve isn't depicted as a bad guy, despite remaining loyal to the Federation.
What's intriguing is, despite the anti-imperialist message, all the benefits of capitalism are built into the economic part of the game. The faster you can consolidate your farms into a single New New York, the better off you'll be, because one big city is easier to protect than many small ones. It also gives you more money, which lets you spend more on the military, which further drives your economy, leading to bigger bonuses and more money.
Unfortunately, the entire Earth Mission is full of errors, bugs, and glitches. Every time you place a city, the health bar appears on the other side of the planet. Worse, you can't click on the empty space or on the graphic of the city to access the city repair menu. (Although you can still park your ships in front of the health bar, and they will defend it.) After one level, the health bars reset to the right spot, so you need to move your ships.
Unfortunately, much later in the game, all your ships and cities become invisible, which means you can not repair anymore, and you can't even see what's going on in the battle. There's no reason to play the game after this point; it's a lost cause, and things don't get fixed if you survive a level in this condition.
Other than that, there's a lot of potential here. I like the novel defense-hybrid gameplay, and the tight integration of the story with the game. The voices could have been better, and I think SouthPark's stream-of-consciousness style of humor loses some of its punch when it's text-only. I hope they fix the bugs, because I'd really like to finish playing this game someday.