Patient Gamers

Sonic CD (the Jap/PAL release, not the terrible USA one). Absolute banger.

Sonic 3/Knuckles. Unironically amazing stuff.

Ecco the Dolphin (CD version). Amazing atmospheric stuff. Hard to believe it's the same composer as the North American Sonic CD

Bonelab with would you even know, don't fence me in and turn around. Some of my favourite video game music moments.

Citizen Sleeper

Evil genius has a soundtrack that fits it perfectly. That game has such a good vibe, like playing The Incredibles if they were trying to take over the world

Furi

Tetris Effect for me.

I just finished Frostpunk recently and have to say I really enjoyed the soundtrack.

One that sicks in my memory years after playing it is the soundtrack for Expeditions: Conquistador.

My favorites:

• Superbrothers: Sword & Sworcery LP
• Hyper Light Drifter
• Into the Breach
  • Basically, Ben Prunty does amazing work. FTL and others have already been mentioned

Hi-Fi Rush

Lollipop Chainsaw

Kingdom Hearts

Guitar Hero 3

Fantastic game soundtracks are the ones which I actually go out of my way to acquire. Chrono Trigger, PixelJunkMonsters Deluxe, SimCity 3000, and Yooka-Laylee and the Impossible Lair.

Bunch of bangers on this list already, but the one that sends shivers up my spine to this day is Crusader Kings 2.

A Plague Tale is a master work by Olivier Deriviere. Take a listen here. It really amplifies the immersion of the game.

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

I'm surprised at the lack of love for 13 Sentinels - Aegis Rim here. It's a little more on the electronic side but fans of the NieR soundtracks in particular would vibe hard with 13S-AR. A couple of standouts - Lysine and Brat Overflow

Tecmo secret of the stars.

I love the soundtrack of underdogs. The song i like the most is ready for war (wraz. Remix) by Dominus and magugu. It feels really good in the game when you get in the big boy arena and this song starts.

Runescape.

Right from the login screen its always been iconic

The entire Ace Combat series, particularly from 4 onward are almost entirely comprised of the best music I've ever heard. I couldn't reccomend all the specific tracks because i'd probably hit some sort of character limit but each game has a "flagship" track which I'll highlight here:

• Rex Tremendae + Megalith -Agnus Dei-
• The Unsung War (special mention to First Flight)
• Zero
• The Liberation of Gracemeria
• Daredevil

Also will reccomend both the Metal Gear Saga (e.g. ...Metal Gear Saga)

And the Boss themes from Metal Gear Rising

• Rules of Nature
• I'm My Own Master Now
• A Stranger I Remain
• The Stains of Time
• Red Sun
• The Only Thing I Know For Reap
• Collective Consciousness
• It Has To Be This Way