It's really addictive to build up speed and then whack the sheep - it reminds me of golf. I like that there was a tryout section before starting the game so that I could get used to the controls.
I think a potential improvement would be to make the pen a little wider so that more sheep can fit in before it starts overflowing - The momentum of a slapped sheep would sometimes cause them to collide into other sheep and push them out of the pen.
I like the little graphics used to represent the sheep.
A quick game about sheep and a super spinning farmer.