You've got an idea-
-Now expand on it. It seems like you've got the mechanics of this game down, but... There's no point.
Try adding a score system.
Have balloons in the background be worth more points than the ones in the front.
Try throwing in some power-ups (Machine gun, time freeze, larger scope; I just came up with those in a few seconds).
Who knows, maybe you could add levels with mountains or planes flying by to make things more challenging.
Right now it isn't much of a game, but you've got the basics down, all you need to do is expand on them and you'll have a much better game in no time.
it is just the same for the entier game
the graphics were kind of good but i think there are many games of the same kinda better than this one... if you want to stand out you should spend more time thinking of that special touch of new that is going to blow us away and getting better graphics and better sound...