OK the way this soundtrack is structured is genuinely clever. Schoolday 2 builds its entire score on a two-axis system of atmosphere and sanity, giving you nine variations that shift as your mental state changes in-game.
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High atmosphere with high sanity sounds almost normal, like a regular school day. But slide both dials down to low and the same musical foundation warps into something deeply wrong. The mid-range combinations are where it gets really interesting, that uncanny valley of "something's off but I can't tell what."
Even as a demo, this adaptive approach to horror scoring stands out. If you're into games that use music as a mechanic, not just background noise, pay attention to this one.