9/1/15 Update changes:
1. Option in options menu for hiding the mouse, off by default. The mouse is only hidden over the playing field. You can use space bar instead of clicking to avoid accidentally clicking on the site. If you don't like using space bar, left click still works. Thanks for the suggestion, I like the game a lot better this way!
2. Hitbox for bat is taller so it is slightly easier to save balls by catching them with the side of the bat.