The soundtrack is pretty great, does anyone now if they've made it available for sale or download anywhere? Thanks.

I got a response from one of the game's developers:

https://twitter.com/Habba2/status/1130458461760827394
Hi! It's actually stock music, so we kinda can't release the soundtrack. Would love to if we could though. The music is by https://audiojungle.net/user/pandocrator