Crunchy, cartoonish, and surprisingly groovy. Grindstone's OST from Capybara Games sounds like someone scoring a puppet show about Vikings who really like to party. "Grindstone Mountain" has this stompy, percussive thing going that matches the satisfaction of chaining together massive combos.
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"Bone Dust" goes darker, grittier. "The Boss" brings the tension you need when you're three moves from dying on a board full of creeps. Seventeen tracks total and none of them overstay their welcome. The whole thing has this handmade quality to it.
Fits the art style perfectly. If you've been grinding through the game on your phone without headphones, you're missing half the experience.