ummm...
I gotta give you credit, It has some potental (especially for your first flash game), but.... well, let me list the pros and cons:
pros:
good music
works surprisingly well
Cons:
better graphics, this includes a menu background, a picture for the ball (perhaps you could make a mine for the ball instead?) and background of the actual game
more music (two songs get's kinda stale and repetitive)