Takeshi Abo called this "geometric music" and honestly that's the most accurate description possible. Remember11's Sound Collection is thirty-four tracks of psychological tension scored for a visual novel about consciousness transfer and quantum mechanics.
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"Paranoia" and "Fear and Insanity" do exactly what their names promise, building dread through dissonant synth layers that feel physically uncomfortable. But it's the quieter pieces that really get you. "Dreamy lens -Piano-" strips everything back to something achingly human, and "All or None -Piano-" does the same for the game's central theme.
The way tracks like "Shadow" and "Thanatos" use silence as an instrument. This is one of the most psychologically intense visual novel soundtracks on PS2, full stop.