I'm curious. I suspect a lot of favorite games will be mostly originating from nostalgia.
My favorite game has to be Super Paper Roblox. I love games with a story, and I love obbies. This had both, and a ton of Easter eggs I enjoyed spending my time trying to find. I read all the dialog, even taking time to go back to all the areas each chapter to find all the dialog updated with new stories and epic humor that I very much enjoyed. The second and third play though were only better.
I would love to hear your favorite games!