I played a bit.  Good job on the game    Here are some problems/observations:

-The power bar goes far above the marked max power level

-The Sound trigger for the ball falling through the left or right channel is too high, and
  it is sometimes triggered without the ball falling through

-One of the bumpers directly above the center holes makes it very easy to rebound the ball straight down the center.

-The paddles aren't flush with the guides (specifically bottom right paddle)

-Name entry and numbers on the placings in the highscore table would be nice

-Spacebar to Fire and a key to start a new game would be nice. Lazy people don't like moving their hands out of position to click the mouse

-The ball gets stuck up in this left corner with no way to get it out.  I took a snap of where it stops, for reference: