The fact that a free fangame has a soundtrack this polished is kind of insane. Undertale Yellow nails the Toby Fox style while carving out its own identity completely. Fever Pitch goes so hard for a battle theme, all this frantic energy building on itself until you're white-knuckling through encounters.
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The Honeydew tracks are something else though. Honeydew Cabin, Honeydew Snow, that whole suite creates this warm melancholy that sits with you. Just really tender stuff. Then Occupied Turf flips the mood with this tense swagger that feels like a proper standoff.
The way each area's main menu theme shifts to match the region is such a thoughtful touch. If you thought only official Undertale music could hit this hard, prepare to be proven wrong.