Get the Luna's Fishing Garden soundtrack - 5 in-game music tracks made by Paul Zimmermann, provided both in mp3 and wav formats.

The soundtrack is going to be available in your library and on the game page itself under "Additional Soundtrack", but in case you want to access the files directly: right click on your game in Steam library, select "properties" -> go to "local files" tab -> click on "browse local files." The soundtrack is located in the game's "Soundtrack" folder.