There oughta be a bundle including this game, the soundtrack and goodies such as artwork and desktop backgrounds. The lack thereof is a waste of such gorgeous artwork! :-/

I just finished the game and since I was wondering about this (missing soundtrack for what is kind of a musical) as well I decided to ask the devs. I am sure their reply will be helpful to others as well so here it is:

"Getting the soundtrack on GOG is on our to-do list. In the mean time you can listen to the soundtrack on Spotify or on YouTube, it can also be bought on Steam. And yes, the end credits song is the one titled "Song from Figment". https://www.youtube.com/watch?v=BNgeXxydBLk"

Here we are, so many months later, and the soundtrack still isn't available for purchase here. For anyone interested, the soundtrack can be purchased on Bandcamp, which offers a variety of formats (including lossless).

And finally, here it is :)