The SNES is doing things here it has no business doing. Shin Megami Tensei II's soundtrack by Tsukasa Masuko pushes the SPC700 into genuinely unsettling territory, and the alignment themes hit different when they're coming through 16-bit hardware.
Read more
"3D Virtual Battle" has this cold, mechanical pulse that makes random encounters feel like you're fighting inside a mainframe. The "Chaos" track builds with these distorted synth layers that somehow feel more oppressive than anything on newer hardware.
And "Cathedral of Shadows" is just. The way it sits there all ominous while you're fusing demons at 3AM. If you've only played Nocturne, go back and hear where Atlus learned to make dread sound this good on a cartridge.