Before VA-11 Hall-A even fully existed, Garoad was already building this world out of synthesizers. The Prologue OST is rawer than the final game's soundtrack and you can hear it. "Metropolis" opens with thick, layered pads that feel like a city booting up.
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"Underground Club" goes full dance floor, heavy kicks and all. The early version of "Karmotrine Dream" here has this slightly rougher texture that honestly might be better than the polished one. "Strictly Business" keeps things moving with a tighter groove.
Some of these tracks evolved into the final game, some didn't make it. That in-between quality is what makes this collection interesting. If you want to hear Walhalla's sound before it crystallized, start here.