The game's pretty fun, though i couldn't get the side missions done from Mission 9. Not shooting isn't much of an issue in itself, but at least don't have the game spawn Migs that you have to dodge along with homing missiles from four missile subs. The screen turned into such a cluster of everything it reminded me of Touhou. The 'shoot 60 missiles' side mission from the same Mission 9 is equally bad, as odd as it may sound, since then you also have your shooting direction to keep track of. It's just too much at once.
But i gave this game four stars, not one, so rest assured that these are minor things when looked at the game as a whole. There were some other minor things (someone mentioned tanks driving over water, enemy collision was odd in that it was in the loading screen but absent in the game itself etc.) that dropped the rating down by another half a point, but 'tis a good score regardless. :)