Super Monkey Ball 2 - not in the sense that I'd want to sit and listen to them, but they really fit the game super well. And I've heard them sampled in actual songs before... Also as YouTube video background music many times.

Destiny 2 has some fantastic pieces. Deep Stone Lullaby, Journey, Aethenasia (sp?) to name a few.

Pillars of eternity 1 and 2, octopath traveler, Chrono trigger, streets of rage, sonic 1-3, and doom eternal were all pretty amazing

I got one I'm betting we won't find on here yet...

Alone in the Dark 5, an incredibly ambitious game that fell short, but had some great ideas.

One of which was how that incredible soundtrack by Oliver Deriviere drove this particular playable sequence, 59th Street .

The whole soundtrack done in conjunction with "The Mystery of Bulgarian Voices" is absolutely stunning for an action-horror title.

It was the best part of the game and an incredible example of meshing soundtrack with cinematic gameplay.

. . . actually? All the stuff he does is freaking awesome, so see/listen to his other titles like:

• Remember Me (Awesomely underrated!)
• Obscure

Other (lesser known / thought of?) good soundtracks off the top of my head:

• There Came an Echo (by Big Giant Circles. So good they used the theme in Stranger Things! Season..2?)
• Anything by Supergiant lol.
• Oni (bungie / rockstar)
• FTL
• Metro 2033, Metro: Last Light, Metro: Exodus
• Deus Ex: Human Revolution
• X-COM: Enemy Unknown and X-COM 2.
• King's Quest VIII: Mask of Eternity

I'll probably add to this if I think of any more. :)

Killer Instinct 2013

Xenoblade Chronicles, especially 2 and 3 in my view.

And Halo, obviously.

Ori and the Blind Forest and Ori and the Will of the Wisps.

God of War (2018) and Ragnarok.

Subnautica. Love the atmosphere that the music conveys.

I really like the Rome Total War Soundtrack by Jeff van Dyck

I would like to throw in Terranigma's OST. Specifically, the Hometown theme song.

Unreal

Chrono Cross.

OTXO and what's even more impressive is that the developer of the game made the music himself! GhostRunner had a bangin' ass soundtrack too.