The demo OST is now available on Bandcamp for purchase and download!
https://sylvysprit.bandcamp.com/album/no-need-for-flowers-ost 
If you like the music in the demo and want to hear more, consider checking it out there! Also, when you buy the album, you'll receive a free upgrade to the full version once the game releases next year!!
This OST contains some of Princess Sylvysprit's best work yet, so definitely go check it out.