Time for self-reflections, now that we are about 2/3rds through the year.
I have stuck with a handful of the same games since the beginning (BotW, DOJWL), while others have come and gone (Detective Pikachu, MH Stories, Terranigma, Sin & Punishment). I am beating games, but it feels incidental. I'm enjoying what I'm playing and I don't feel any drive to beat a game just for the sake of it. Dropping a game feels fine because there's always something else off the shelf to play.
Arcade games -- which I tended to pick up and drop in favor of investing into sp campaigns -- get a lot more mileage under this restriction. I am spending a lot more time chipping away at them instead of using them as filler. Perhaps related, when I do invest time into a meaty sp game, it feels a lot more satisfying to break away from the arcade-style format.
There are quite a few games I've added to my "want to buy" list for next year, but I'm also trimming quite a few games off that list as the year goes on. In a way, this challenge is helping me refine my tastes and to buy games that I really want instead of buying games that I think I'm supposed to like.
I won't be able to do this challenge next year, though, because new Guilty Gear.