Danny Baranowsky made a platformer soundtrack that goes so hard people listen to it completely outside of the game. Super Meat Boy's Nice to Meat You collection is indie gaming's definitive pump-up album. Forest Funk opens Chapter 1 with this infectious bassline and keys combo that's been stuck in people's heads since 2010.
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Betus Blues shifts into crunchy, almost industrial territory with driving beats that match the increasing difficulty perfectly. Then the dark world variants of every track twist the originals into something heavier and more distorted.
Battle of Lil' Slugger with those guitar riffs. The light-to-dark world contrast in every chapter is genius compositional design. If you've ever rage-quit a wall jump and still bobbed your head, you already get it.