There's this raw, earthy warmth to the whole soundtrack that makes you feel like you're actually sitting around a prehistoric campfire. Tail of the Sun's GM-PROGRESS-8 album from 1996 collects both the original PS1 tracks and arranged versions from Artdink's caveman survival game, and the vibe is completely its own thing.
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Primitive Life has this loose, almost improvisational feel with organic percussion and breathy textures. Wild Child Rising builds tension with tribal rhythms that match the game's hunt-or-be-hunted loop. The arranged versions flesh things out with fuller instrumentation but keep that primal quality intact.
In the Middle of the Cave is so still and atmospheric. If you ever wanted a soundtrack that genuinely sounds like humanity figuring out music for the first time, this is it.