A nice game
I liked it, the idea of using a tank to eliminate pestering birds appeals to me for some reason :P lol, just on thing i have to say, the trajectory of the shell changes when you move the target. This is slightly unrealistic. Try to make it so when you click the position of the click is recorded or something and then get the shell to fly at where the click was, not where the target is. Not exactly sure what to do there but if you don't know either you could always post on NG flash forums :D