The Aberrated Variants are the story here. Taking boss themes from earlier volumes and warping them into something glitchier, more unstable, like the game's reality is coming apart at the seams. "VS Picayune - Aberrated Variant" is especially wild, a final boss remix that sounds like it's fighting itself.
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The new Stage 5 and Extra Stage tracks keep the Celestial/Quasar split going, cosmic calm versus crushing intensity. "Zenith" feels like reaching the top of something enormous and looking down. "Doppler" closes it out with that red-shift feeling, everything stretching and fading.
The trilogy ends right. If you played through all three volumes, this payoff lands exactly where it should.