It's fun getting to know games you haven't played before, and for the last few days I've gotten to know Global Defense. Although the game is a bit repetitive and all the levels are more or less the same, it's still an allright game. The flashing in the opening sequence and when the earth is destroyed is really cool, especially if you're sitting in a dark room. And the music for this game is really brilliant! The person who did the music for this game really put his soul into it: the game over-music must be the longest in any SMS-game!
It takes a bit of time to get used to the controls in this game, and at first it feels very annoying that you have to move two things around at the same time - both yourself and where you aim. You will get used to this after a while, though. The game is still quite hard, especially the "defensive half", and you need a lot of practice in order to get good at it. I guess I haven't practiced enough since I'm not that good yet, and I only manage to get to the third level (without cheating). This seems to be a game where the score is the most important thing though, which can explain the very repetitive levels. I guess it wouldn't hurt if they had let the game be a bit more variated.