I really like the idea
I really like the idea of the game, though it would really need a Context and better graphics to become a hit, Also, having the canon in the middle of the screen isn't looking great, maybe having it at the bottom on the ground and maybe having something blowing the balloons would be my suggestion. Also the levels looks really long you should take parts of the songs making it longer/harder by levels =). Good job the idea is pretty sweet though either if this get blam or not I hope you take this comment in consideration. =) you get a protection point from me,