For another indie game you might not have heard about Skald: Against the Black Priory was a surprise hit with me when I played it earlier this year. Cool story and world building, very concise and conscious of its budget limits so smaller in scope, probably a 16-20h game with no filler and no grinding. I liked it a lot, and it should play great on the Steam Deck too. Sort of a tribute to retro CRPGs but without the clunk of those old games. Combat was simple but fun, not overly complex. Beautiful pixel art, especially the splash screens.
I am way less high on Ghost of Tsushima than most people. I would never even consider a second playthrough. The game is way too long for what it is, which is essentially just a more polished garden variety Ubisoft open world game. There is not enough variety in it to sustain a what - 60h playthrough? The quest design isn't interesting or varied enough and most importantly: the writing isn't varied enough. You can't have 60 hours of dialogue delivered in only a stoic, dour monotone. 15 minutes of Kenji spread over a handful of moments isn't enough to break it up. Anyway, rant over.
Okay what else... Well, Blue Prince came out this year and is a contender for Indie of the Year - maybe even a potential Game of the Year nomination. I liked it a lot, a puzzle roguelite is an interesting concept and if you like note taking and screenshotting and escape room type puzzles you'll have a good time with I think.
Otherwise I won't be the first you see of this if you've been scouring these threads, but Clair Obscur: Expedition 33 is almost a shoe-in for game of the year and the hype is most certainly deserved. Any gamer should do themselves a favour and experience it, not least to be able to participate in the zeitgeist.
I think - beside the DLC - the two things that are most hidden and most likely to be missed by a natural first playthrough are The Great Hollow and the Painted World of Ariamis, so feel free to look those up if you haven't found them after you're satisfied poking around on your own. But yeah as you've noticed the game is absolutely chock full of secrets.
Do make sure you get to the DLC too, it's got some great content, as well as the most fun bosses in DS1 - with one of them being an absolute icon. Still won't be very challenging compared to Elden Ring, but a step up from the base game.