Cool game!
Once I figured out that the mouse was "pulling" the end of the arrow and that is how to aim I had a lot of fun. It would probably be nice to tell the player that in the beginning.
It's really cool that you included the "death" balloons in the mix; I think that makes it a lot more interesting. Without them you would have nothing to avoid when shooting.
Some music would def go a long way, but overall a fun entry!