In addition to Bandcamp, you can get the OST on Steam! It's got a launch discount, and you can save a little bit more by getting the RD + OST bundle. store.steampowered.com/app/1588900/...
Save 10% on Rhythm Doctor OST on SteamThis is the official soundtrack to Rhythm Doctor, composed and produced by fizzd, celesti, Riya, and various guest artists!store.steampowered.com