The 17-track digital album contains the stage themes included in the physical release pressed by Aniplex in Japan, along with background music from the "Eden Encore" downloadable content.
From the product page:
Swing, climb, and jump your way through massive “gardens” of vibrant other-worldly plant-life in this truly organic platformer and grow each garden as you explore and guide your tiny yet agile "Grimp" toward the elusive "Spectra" which are hidden throughout each stage.Apple Music - PixelJunk Eden Complete Soundtrack