A wonderful concept, awkwardly executed
I think the issue here is that it conforms too much to standard platformer conventions, although i can't see exactly where I personally would go about altering it, a variety of tools as well as just the ball would make for a more interesting game.
My dislikes here are the controls, particularly the use of the mouse and keyboard in what - I think the majority of reviewers agree - should be a keyboard-only game. The pitfalls, traditional platformer stereotype, are unnecessary in what is more or less a puzzler.
I think as well that the lack of variation in environments are noticeable; although the character cannot see, perhaps a variety of sounds and textures would be interesting, as well as offering the potential to add to some puzzle elements (e.g. hollow walls, rough grippy surfaces)
other than that, bravo on the originality, and the music is simply wonderful