I didn't get to devote as much time as I liked to this game over the past week, but I have managed to do the following changes:

• Added Music (The tracks are rough demos at the moment.)
• Music Toggle Now Works
• Added sprite for when the paddle is equipped with the laser.
• Added a placeholder intro wishing a happy 32nd anniversary of the Game Boy's release.
• Cleaned up onscreen text.
• Levels have proper titles now.
• Added placeholder stage select screen.
• Added another multiball power-up to stage 4.
• Some other stuff I can't recall because I'm bad at logging changes.

Not quite the "press-ready" version 0.69 I wanted, but I think it's good enough to actually make an effort to share.