Will there be a OST of the game in the future?
If you want to look for OST - when you enter the buildings, the name of the track can pop up in the bottom right corner, same place where other credits show up (you do need to have an option "Corner Credits" turned on in general settings for that). I believe all the music that Manyakis is currently using is public domain, so you should have no issues finding the songs, all while the best anyone else can do for soundtrack is to compile some sort of youtube playlist.