looks like this game has its own original soundtrack, which hasn't been released that i know of as of yet, though it looks like it'll be up relatively soon. the composer (listed in the game description) tweeted out track names , and my best guess is that it's probably "Drown Me Deep (feat. Brubs)" though of course we'll find out for sure when the soundtrack drops ^_^ looking forward to it!
in the meantime you can listen to it via the game's files (/www/audio/bgm)