This game has potential, hence the 4/10, but I have a few problems with it:
1) The introductory story is far too short. As short and vague as it is, you could have just done without it and just said, "Kill enemies, destroy buildings." There is a lot of potential for a more interesting back story. As it is right now, there's no way to tell if the player is actually trying to defeat a dangerous enemy, or taking over a planet and killing innocent people who are just trying to defend themselves. A motive for killing these people, even if the player is actually the villain, would make the game more interesting.
2) The targeting is off. I have shot at the same missile or building or person over and over, with the cross hairs perfectly centered over them, and missed over and over again.
3) The area scrolling is slow and awkward. There is no way to tell if there are buildings outside the frame I'm focusing on without scrolling over to look, and that is a low priority when there are twelve missiles all coming at me at once.
Like I said, this game has potential. As it is now, I wouldn't play it again.