I made some C64 games. The first one, snek, was made for a one-month game challenge in my local retro gamer group.
It was the first time I programmed something for the C64 (outside of silly endless loops in BASIC). I wrote the games in 6502 assembler (dasm) and made the music using CheeseCutter.
As a present for the top players at the retro gamer meetup, I made some physical copies with nicely printed labels.