Jesus!
Slow that down, make the animation smoother, because that is just too damn fast for me! I only started to gain a respectable score by waiting for Herman to pop up from behind the fence, he's easier to hit there. It's just too quick.
I also think you should add a time limit to the mix, to pressure people into ending the game earlier. I could have just shot Herman behind the fence for hours, but it got boring! A time limit would give people incentive to try and beat a previous effort.