The Astrologaster soundtrack composed by Andrea Boccadoro with lyrics from Katharine Neil is now available on Steam and Bandcamp.
The soundtrack contains all songs from the games and comes with lyrics in pdf-format.
It is on offer right now. If you own the game the cheapest options will be to complete the "Astrologaster Collector's Edition" bundle.
Do you have a facvourite song?
https://store.steampowered.com/app/1111550/