Interesting and unique concept. I always find hand-made MS Paint style pixel graphics charming. It give the game a lot of character, especially compared to the AI generated ones.
Offering options for the ball’s appearance was also a nice touch.
I think the game could benefit from a longer cooldown between shots. This would make the player consider the angle more carefully. Right now I was able to get pretty far just by spamming the C key.
Also, having mouse aim could be a good idea.
Nice entry.