https://steamcommunity.com/games/266210/announcements/detail/6624298684105325018 Apparently the game got fixed up for deck a bit, so maybe the music works properly now on Linux.
Music (past the main menu) is broken and has been broken in Wine for a very very long time. Still true as of Proton 4.2-4. See: https://bugs.winehq.org/show_bug.cgi?id=41345 It's relatively minor, but IMO still enough to...