This is a really lovely and constructive comment, thank you a lot :)
Someone else has also asked if its the xbox sfx but I never had an xbox, but it might be as I just found it on a free sound effect website. I did not compose the music but it's a good idea to credit the music more!
I was working on a dynamic material on the paddle to show where the ball was hitting but it get too complicated, but I agree I think that would be a good QoL improvement. I agree the colour choice is not ideal.. perhaps it would be better to have a direct colour selection rather than a slider.
More hats? haha that would imply you unlocked all the hats at level 20 which I don't believe you did :D