Too hard
This is incredibly hard, you know? It took me like 10 attempts to be able to hit the first tank before it hit me. And this only because by then I had already memorized the exact moment when the tank would show up... I coudln't get past the second target, of course. Enemies never fail to shot us. Graphics are poor and there is no sound at all. The concept of the game, however, is not bad. Add in sound and make the animation smoother so we can actually realize the tank is there before it shots us down, and this may become a good game :-)