Some of these might be from the 80s but whatever they're good
Blood is the best of the og build fps games imo
I have this whole thing about how those games are all based on exploitation cinema and that's a big part of why they work.
Anyway also Phantasmagoria 2: A Puzzle of Flesh is incredible... if you can get it to run properly.
If you've never played the classic point n clicks like The Secret of Monkey Island, Maniac Mansion, the King's Quest series, the Quest for Glory series, Sam & Max, etc... those are good too.
Tyrian is a fun time with great music if you like bullet hell space shoot games. Much more accessible and funny than most games in that genre.
I have a friend who swears by Marathon, and I like it pretty well, too. Super revolutionary for the time.
Myst is a classic for a very good reason, as is Riven.
System Shock and System Shock 2 are both rad as hell but also tremendously clunky and janky, though for me personally that's part of the charm.
Loom is another point-and-click that kicks ass.