All of Jens Vide’s music from the game is available right here on itch!
System ST91’s contributions were commissions and I don’t think he’s made them available for sale but he’s got a lot of stuff on his bandcamp page. I especially recommend MindHacker, his Ghost in the Shell tribute as it was why I commissioned him in the first place.
I got Riot Revolution off of Wimus’ soundcloud many years ago but I don’t think it’s available anymore.
I haven’t talked to all the artists about putting together a soundtrack release. It is something I can look into though, one of the songs was made by me personally so that would be a no-brainer.