Interesting concept, although a little confusing at first. I didn't realise the ball ran away from the mouse cursor at first. It's not very consistent, so it's hard to tell what it's doing!
I like the idea of modifying the maze itself, although in practice I just found myself doing a quick visual solve in my head, then walling off the ball so it couldn't move backwards away from the goal. Then you just have to chase it to the exit!
Congrats on submitting a working game! Not an easy task at all.