Okay this one is genuinely creepy. Sally.EXE & Rouge.EXE sits in that Sonic.EXE horror fangame space and the soundtrack commits fully to the bit. "Kind and Fair" starts deceptively normal, like a slightly off Sonic zone theme, then things deteriorate.
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"WEALLFALLDOWN" is just layers of corrupted audio and binaural tones designed to make your skin crawl. The multiple versions of "Act 9" show how one melody gets progressively more destroyed through reverb and distortion effects.
"Hill Zone" almost sounds playable, like a real stage track. Almost. The whole thing is more sound design experiment than traditional OST. If you're into the .EXE creepypasta scene this is exactly the kind of audio nightmare you want.