Glitched and annoying.
Well, first off, I suffered through the entire game just for the medals... and they don't work.
The concept is good, and meaningful at best, but putting the concept into the form of a flash game just isn't plausible. It simply wasn't fun. There's a very fine line between challenging and annoying.
Also, there's a game-breaking glitch that made it a lot harder to finish. About halfway through, the ball simply stopped working, leaving me to navigate by trial and error.
I wish I could offer better advice; I just think blindness is best kept seperate from gaming.