Steins;Gate 0's soundtrack carries this persistent sadness that the original never quite reached. Messenger sets the tone immediately, darker and more worn down than anything in the first game. Amadeus is haunting in the way it blends synthetic textures with piano, perfectly mirroring the AI character it's named after.
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Then you get tracks like Isolation and Shuddery view that just sit in this uncomfortable tension without resolving. The piano arrangement of Fellowship strips everything back to raw emotion. Even the lighter tracks like Okey-dokey feel like they're trying too hard to pretend things are fine.
Berserk finally lets the aggression through when the plot demands it. If Steins;Gate wrecked you emotionally, 0's score twists the knife deeper.