This thing runs on pure arcade FM synth aggression and it absolutely slaps. Ninja-kun Ashura no Sho dropped in 1990 and the sound design hits way harder than you'd expect from a cute ninja platformer. Theme of Ninja-kun has this bouncy, almost cocky melody that loops in your head for days, then the Boss Theme flips the energy into something genuinely tense with these rapid FM stabs.
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The Underwater Theme though. That one shifts into this floaty, eerie tone that feels completely different from the rest of the soundtrack. Cave Theme pulls off a similar trick but darker, moodier. If you're into late-era arcade sound chips doing more than they should, this one delivers.