There's this tension baked into every note that perfectly mirrors the feeling of staring at a bad hand with 1 HP left. Slay the Spire's soundtrack by Clark Aboud nails the roguelike loop without ever getting old across hundreds of runs.
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Battle Trance has that driving energy that keeps you locked in during normal fights, but The Guardian Emerges shifts into something genuinely threatening, like the music itself is telling you to pay attention. The City is pure atmosphere, this moody downbeat that hits different after clearing a tough act.
And then The Heart track. Just dread. If you've sunk 200 hours into this game and never actually listened to the OST on its own, fix that tonight.