Deliberately crunchy chiptune energy that sounds like it was beamed in from a Famicom that never existed. The whole thing commits hard to 8-bit aesthetics even on modern hardware. "DEFEAT F$%KIN' EVILS!" is exactly what it sounds like, a frantic pulse-wave assault that matches the game's chaotic tower defense action.
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"えい えい おー！" has this triumphant marching feel, fist-pumping NES energy. "真夜中の大掃除" (Midnight Cleanup) gets surprisingly moody, dropping the tempo into something almost contemplative before the next wave hits. The rejected track "ボツって騎士" being included is a nice touch.
If you miss when games sounded like controlled explosions inside a sound chip, this delivers.