Well, you know, something alike to early Jim Kirkwood albums.

Games like Witchaven 1-2 or Heretic/Hexen.

I'm seeking the same atmosphere whatever the genre.

DreamForge's dungeon crawlers like Menzoberranzan or Anvil of Dawn, maybe?
The composer's name is Jamie McMenamy.

youtube.com/watch?v=yUdCUDGOrbw
youtube.com/watch?v=W9lfTWH85IM

Jamie Mc'Menamy is the composer of War Wind 1-2 OSTs, and War Wind 1-2 are in my forever Top-10, so I do know him of course.

I don't seek games with DS-like music, I seek games that fit the overall aesthetics of DS: the gloomy dream-like fantasy soaked in the 80s spirit.

Maybe the Diablo 1 could fit but it lacks that dream-like quality.

Lords of Midnight, that's it. Vast dreamy soundscapes.

I don't know if it fits your criteria, but MageSlayer maybe?

Menzoberranzan was fun but the ending was a complete disappointment. It was so bad that it put me off of trying Descent to Undermountain.

I don't want to open a new thread for the " Dungeon synth " music category , so i just post this in here :

https://www.youtube.com/c/TheDungeonSynthArchives/videos

Cool, thanks for posting.