I was playing with a pen rather than a mouse actually, which is probably not what you programmed it for. That might be part of the problem. I hadn't thought of that.
Oh that's probably the reason it went so slow. You would have to make sure the pen had contact with the screen the whole time. I'll bet the invisible ball that follows the mouse thought the mouse disappeared occasionally. That would be really frustrating so good job getting through to the end of the game!