Patient Gamers

Hyperlight Drifter

Cobalt Core

They're in the same vein but it's some of the best chiptune-esque music I've ever heard. They're not these one note, one tempo, same vibe over and over again tracks. They have feeling and movement. Almost melancholic at times. Scary in the case of HLD. They remind me a lot of mid 2010s prog metal in some respects. Not the heaviness or the distorted guitars, but the melodies and creativity with sound that pushed music forward in those years. Like the last track of the Cobalt Core ost flows right into My Last Serenade by Killswitch Engage and it's a chefs kiss of greatness. They're both top 5 video game ost for me.

Chrono Cross.

All the Astro Bot games have phenomenal soundtracks, Kenneth CM Young (of MediaMolecule) is brilliant and knows how to write really catchy earworms. Really got stuck listening to Trapped in Time and Papa Tree.

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.

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.

Civ 3 has my fav soundtrack. My favorite is this gem you get in the modern era:

https://youtu.be/MPe5an9VltI

Literally every Supergiant game.

Metal: Hellsinger https://www.youtube.com/watch?v=HidvYgF9-8Q&list=PLJQHL1SwXgq0m1LuxDGHDEWnBDFdYc2Vk&index=9

Planescape Torment and Icewind Dale. Not all the tracks but many of their tracks are great. I play them on the loop.

Also The Witcher has great soundtracks, I often play them on the loop while I was working.

I don't think I've seen any shmup OST mentioned, but there's so many that I think are bangers.
A favourite of mine would be DoDonPachi DaiFukkatsu / Resurrection, specifically Black Label Stage 2.

• Bravely Default kicks with both special and battle themes (go give vagrant of love a try)

-Gran Turismo 4 suuper nice menu themes i especially like hypnosis, the motorious zone, don't kick yourself and be at home

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.

None mentioned (all links are yt) Axiom Verge (s), Defcon, Element4l, Furi, Giants Citizen Kabuto, Painkiller, Risk of Rain (s), Speed Runners, They Bleed Pixels, Wildstar or any Zachtronics so far.

Nobody's mentioned this one yet, perhaps because it's a bit obscure, but Vib-Ribbon (PS1) has such a unique and endearing OST. I never played the game, but I heard one of the songs and got totally hooked.

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. :)

Rebel Galaxy - country rock genre? Very unique and different sort of music.

Trine 1 & 2 + Transport Fever 1 - instrumental background music good for concentration, working, studying or just relaxing.

Gonna list 2 that deserve the "great soundtrack" tag on steam:

• Assault Android Cactus - twin stick shooter/bullet hell with cute android girls blasting robots. Techno stuff, with my 2 favorite tracks being Liquorice (it's divided in 3 "acts" as it's a boss music) and Assault
• Cloudbuilt - 3D platformer with focus on speed. I suck at this game, but the tracks are amazing, with my fave being Aurora

Someone else mentioned Unreal 1, but I gotta say, Unreal Tournament 2004 has some absolute bangers, like Morpheus3, Hyperblast Redux, Level11 and Convoy