Mine are Subnautica, I've put myself in danger in that game just for the music.
Honorable mentions include horizon (zero dawn specifically, but I am currently playing through forbidden West for the first time, so I still might prefer it), Halo(CE), and Skyrim for me as well.
City on the mesa is my personal favorite! Also, looking at the album again, something needs to be said about how big that soundtrack is. It contains eighty songs.
Absolute favourite game soundtrack? Frostpunk's OST. The soundtrack really brings home the desperation and harshness of survival in the cold. When the storm is coming and the music swells up... goosebumps. Every single time.
Divinity 2: Original Sin has a great soundtrack too. Kinda surprised I couldn't find it in the comments. Minecraft as well. It's very soothing and calming.
Aside from that, some smaller titles with great music: GRIS, What Remains of Edith Finch, and FAR: Lone Sails.
Might be a controversial statement, but I love Persona 5's music and art design way more than I like the actual game, if I'm being honest. The anime tropiness isn't really my thing and I'm not a huge fan of the writing, but the vibes of that game are immaculate.
Unreal Tournament and Deus Ex both come to mind. Alexander Brandon was involved in both and his work is absolutely amazing.
If we talk specific singles, though, it's Morrowind (Nerevar Rising), Control (Take Control), and, recently, Baldur's Gate 3 (Raphael's Final Act). Morrowind's tune is so ingrained in my mind that it's my to-go whenever I get my hands on a keyboard.
Great choices there! the Unreal Tournament and Morrowind soundtracks have been stuck in my head for a long time now. UT in particular -- I listen to the full album about once a week while I'm working.
I never played Deus Ex when it came out, so I don't have the nostalgic attachment for that one, but I just discovered this a few days ago: https://alexanderbrandon.bandcamp.com/album/conspiravision-deus-ex-remixed. I bought it and am giving it a full listen today. Highly recommended; probably that much better if you're a fan of the game.
Sonic (just about every game in the series): even during the "dark age of Sonic" ('06 through Unleashed) and in flops like Forces, the one thing the series has consistently gotten right is the music. Jun Senoe will rarely steer you wrong.
Ace Attorney (also the whole series): has it all - some fun melodies, tracks that fit the mood whatever it might be, great character themes, and just about every Pursuit theme is an awesome hype track.
Octopath Traveler (the original): I love the instrumentation, more wonderful themes for characters as well as locations, and the Battle II music has to be my favorite battle music in any JRPG ever. I'm a sucker for good string music.
If I had to pick one... Katana ZERO. Nice mix of genres, really emotional soundtrack, lots of synthwave type electronic, all of the artists who contributed songs really put work and passion in there, they work excellently for the game, and are awesome to listen to in their own right outside of the game.
Love it too!
One that has been my top listen count for years is The Witcher 3 OST. The use of some slav traditional instruments was nothing I've ever heard like before, and it resonated a lot with the story. Special mention to:
The Wolf and The Swallow for giving me the chills everytime I listen to it
Hail To Caranthir also has something special to it.
Although neither tracks are part of the published albums :/
The spin-off Strikers has the absolutely brain-infecting Love te Wonderland
However, I've recently finished Cassette Beasts, and it's a really really strong contender. Imagine creating an OST piece as amazing as Same Old Story, then going back and adding lyrics for it for when you are fused. And then there's the even more phenomenal Shot in the Dark (only linking the lyrics version here).
Always enjoyed Skyrim's soundtrack, but while I love it, I still enjoy and prefer Oblivions soundtrack more.
Oblivion was my introduction to the Elder Scrolls universe and the music from that game has kinda become embedded in my mind. Just my general go to music for fantasy environments including for DND or Pathfinder sessions.
I love Morrowinds music too, but if I had played Morrowind back when it first came out, I would have ranked it's soundtrack higher than Oblivions.
My favorites are ffxiv, because the music is very closely woven into the story with motifs and stuff, so it brings me back to it. Its also just pretty as fuck, they do a lot of weaving other songs and musical themes into other songs, so a lot of the time you'll be in a boss fight and recognize a theme from earlier, mixed in with the boss music. Some context is spoilers, so I won't go into it, but the Endwalker final boss has the music shifting from each previous expansions themes, morphing and shifting to fit the overarching boss theme, and its fucking glorious.
Also, the ace combat games have the most insane music, its basically a meme that "everyone's a badass until the sky starts singing latin at you" Its this really cool mix of operatic vocals and rock/synth music and its so fucking good.
The Final Fantasy VII and Kingdom Hearts series have my absolute favourite soundtracks
Others that stay rent free in my head are Mickey Mouse and Donald Duck in World of Illusion, halo 3, odst and reach, theme hospital, sonic 1, 2, Ape Escape and Gain Ground
I feel like Payday 2s sound track is underappreciated in general conversations about game music.
It has gotten a driving beat to it and instills both anxiety and courage. Not to mention how they have a system similar to the L4D2 Director system where the gameplay is perfectly matched and foreshadowed by the music.
Little Big Planet. Every level's music track brilliantly fit both the aesthetic and tempo. The sequels never cam close to capturing that same magic as the first one.
As a teen, I used to fall asleep listening to Might and Magic VI. You could literally put the disc in a player because the soundtrack was saved as wav files.
I can't believe nobody has said Furi! That game lives through its soundtrack. The game is a series of intense boss fights, but during production they sent concept art and fight details to the artists so the music better matched the scenario, and it all came together beautifully.
I really dug the music in CP2077 (and, especially, Phantom Liberty). The use of leitmotifs lifted the score. More so than in a similar game (GTA5), I really enjoyed the radio stations, too.
Not sure about my absolute favorite, but the first games to come to mind when thinking about OSTs is Battlefield 1 and V. The music in those games is amazing.
Dark Souls 2. I spent a lot of time standing in Majula just soaking in that music. So comforting yet melancholy, like sitting in front of a quiet fire, knowing in a minute you have to walk through a blizzard.