This has the core of some fairly interesting gameplay. There is a strategy to when you need to throw the ball to get the dog to run away from the enemies.
I did find it difficult to time my sword swings to avoid getting hit the by the enemies. I also noticed that if you throw the ball outside the bounds of the world, the enemies will still go after the dog but you can't get to him to fight them off.
The art would look better if it were more stylized as well. Some of these programs do this anti-aliasing thing, and it makes colors less strong. The text in this game would look better as solid colors.