The original Varstray soundtrack is where this whole series' sound identity got established, and it still holds up hard. This 2015 indie shmup from the doujin scene packs a full electronic score across ten stages. "Don't look back" for Stage 1 and 10 bookends the game with this driving, relentless energy.
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"Real ability of ace" on Stage 3 layers in some really satisfying melodic synth runs over a pounding rhythm. "Confused fight" gets chaotic in a way that matches late-game bullet density perfectly. Something about how the stage clear jingle "Serves you right" hits after a tough boss.
If you want the definitive version of this series' sound, start here before the sequels.