It's interesting that some of the complaints have been a lack of powerups or special blocks. In my limited understanding of Zen philosophy, those things would seem to counter to the idea of a Zen game, which should inherently be simple and elegant in its form. I do agree that the high, sharp beeps are very jarring, and don't contribute to the overall Zen theme. Perhaps a chime, a low gong, or the sound of water dripping into a pool...
But if you really want to go Zen, then the objective would not be victory, or the accumulation of points. The objective would be the path itself, the discovery that comes from the journey. Are we the paddle, or are we the ball, or are we perhaps the bricks themselves? Could we in fact be all of them and none of them?
Okay, enough waxing philosophical on my part. Overall it's a very nice idea, and a good start for something that could be interesting if you find a unique direction to take it in.