We've released the OST for Quest Giver here on Steam, and with the current launch discount those who already bought the game can get still get a nice deal on the tunes.
It's also available on Spotify, Youtube, and Bandcamp (and other music services) if you'd like to give it a listen.
The best way to support us is to buy it on Steam or on Bandcamp. Both platforms provide the tracks as 192 kbs MP3, as well as FLAC.
Thanks so much, and enjoy!