Fast, layered synth work that sounds like it was composed specifically to keep your hands locked on the keyboard during a bullet hell gauntlet. Hurricane of the Varstray: Collateral Hazard has this slick electronic palette that fits the space combat setting perfectly.
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"Into magnetosphere of Jupiter" builds with these swirling pads under a hard beat that makes Stage 2 feel massive. "The ravages of war" goes darker and more aggressive with distorted bass. Then "Dazzlingly beautiful universe" shifts into something almost serene.
The contrast between the boss themes and episode interludes gives the soundtrack real dynamics instead of just being wall-to-wall intensity. If you play doujin shmups and skip the OSTs, you're doing it wrong.