Also in the same genre and also fantasy/samurai themed, Sekiro. Not sure about historical accuracy, but you will enjoy the gameplay or die trying. Or both, those aren’t mutually exclusive
Weren’t your feelings positive, though? You did a full playthrough, and you got all achievements - especially considering that’s not something you do usually. I’ve basically done the same, but I don’t consider it a bad thing to not be as interested in the game I’ve already played. And you can use one of your existing saves to do the DLC, considering it will probably be more difficult than the base game, so having a fully geared up build will help
Iconoclasts - really nicely made metroidvania with pixel graphics
Tametsi - a collection of handmade Minesweeper puzzles with additional twists and mechanics. Extremely cheap on Steam
Gunfire Reborn - roguelite FPS with Borderland-ish graphics, decently made 4 man co-op (unlike Risk of Rain 2, you can actually revive teammates that got knocked down immediately) and a lot of difficulty scaling. Notably, still gets new content, both free and paid DLCs (those add new classes and some new weapons)
Edited to add another: Opus Magnum - an automation/optimization puzzle game with alchemy theme. Supports user-created puzzles through Steam Workshop