The castle in UnEpic has like nine different zones and every single one gets its own track that actually fits. This 2011 indie metroidvania by Francisco Tellez de Meneses nails that classic dungeon-crawler atmosphere. "Catacombs" is all low rumbling tension, the kind of track that makes you walk slower even though nothing's happened yet.
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"Haunted Tower" picks up with this eerie melodic line floating over darker accompaniment. And then "Intro Jazz" just comes out of nowhere with smooth jazz because the game's sense of humor is baked right into the music too.
The boss theme goes hard without overstaying its welcome. If you like games that don't take themselves seriously but still deliver solid atmosphere, the soundtrack reflects that perfectly.