Arcanum of Steamworks and Magick Obscura.

Halo Reach, hands down. Phenomenal, all the feels

Witcher 3: Lelelelele

Journey

Golden Sun GBA soundtrack. Also there are some really nice remixes of the fan community. The game is from 2001 but can be played with Nintendo Switch online subscription. As well as the second game (they are basically one game).

How has nobody mentioned Rimworld? Such an incredible soundtrack!

I'll skip the obvious ones with multiple artists like Furi, Katana Zero, Hotline Miami, Crypt of the Necrodancer...

Remember Me (2013) composed by Olivier Derivière

• https://www.youtube.com/playlist?list=PLYXfIgywXknHjMdirPIkDaEOM4cCyceDE

Warhammer 40k: Mechanicus (2018) composed by Guillaume David

• https://www.youtube.com/playlist?list=PLyLLeKcxw24U8s8C24FyUQ0EVS30stymM

Bastion (2011) composed by Darren Korb (anything by Darren Korb)

• https://www.youtube.com/playlist?list=PL53mjgVKFq7yPfCiSJaA_aI2SPKrnEmmJ

Styx: Master of Shadows (2014) composed by H-Pi

• https://www.youtube.com/playlist?list=PLtzah_dj5hUXeBVTne3GZeJuIl2vWwL5P

140 (2013) composed by Jakob Schmid

• https://www.youtube.com/playlist?list=PLSwiiZF6c9CYrvMG-uNkkqzb6J3_-DhBP

A lot of great choices already: Persona 5, Hades, Katamari Damacy.

A kind of odd left-field one I'd like to add specifically for great music in-game, is Guacamelee 2. I don't know that it's the kind of music I'm likely to put on just to listen to randomly, but as far as in-game atmospheric music goes I think it's both tremendous and refreshingly unique amongst the landscape of video game music.

Katamari Damacy!

Assassin's Creed 4: Black Flag is a close 2nd Edit: almost forgot about FEZ!

Chrono Trigger

right now i'll have to go with "The Neverhood Chronicles", it's stuck in my head since i started playing it again last week on a PS1 Emu.

Ace Combat, all of them but especially the PS2 Holy Trinity.

Shadow of the Colossus.

NFSU2, Most Wanted and Burnout 3, even if theyre licensed music and not really original.

Doom midis in general are fun. Touhou games too.

Anything handled by Nobou Uematsu.

Final Fantasy VI, so much so that when OverClocked Remix kick started a remix album, I donated to it

Metroid Prime

Hollow Knight, though I don't really listen to it outside the game.
Cyberpunk has some great songs on the radio.

Morrowind and project wingman are peak. FFXIV is fantastic with a persistent leitmotif across each entire expansion. The final endwalker boss basically wrapped up YEARS worth of story and that fight music was a medly featuring every expansion's leitmotif and holy shit I can't get over how incredible it was. Also the pandaemonium raid music. And Alexander. Seriously you can rabbit hole for HOURS on FFXIV music.

Aquaria: Original Soundtrack by Alec Holowka

Such an underrated game. RIP Alec.

Bloodborne OST is the first that comes to mind for me.

Metal Gear Rising Revengence Need for Speed Most Wanted Hi-Fi Rush

Outer Wilds (and Echoes of the Eye) technically qualifies with the community's rules, but I think the answer more in keeping with the spirit of things is Shadow of the Colossus. The Opened Way is the most "fighting a building-sized monster as a normal guy but still winning" piece of music I have heard

Undertale, Celeste, Katamari, Syonara Wild Hearts, Shadow of the Colossus, Metal Gear Solid, Persona 4G, Persona 5R

Feeling nostalgic and I was just listening to the Pokemon gen2 soundtrack