Key fobs with pictures of the games would make it easier to see which key goes with which game. I've been planning to buy some plastic key fobs and make my own.
Something like this where I can insert photos of my games. https://www.aliexpress.com/item/50pcs-Wholesale-Personalized-Clear-Acrylic-Plastic-Blank-Keyrings-Photo-Insert-Keyfob/32848258624.html