Can you maybe check in System Settings > Audio > Under Playback Streams which stream is chosen? In my case it's
Filter Chain Sink
Maybe try different options to see if you hear any sound.
View attachment 4007844
Thanks, I don't see anything wrong there. You should probably put the output in a spoiler tag.
Can you maybe look in ~/.config/unity3d/beepbopdubi/Learn The Heart/Player.log if there is any errors? Also to make sure, you did play the game a bit? The start screen, for example, also doesn't have sound in my case.
Maybe another problem would be, if you run it in a Flatpak sandbox (there was a problem for me in the Heroic Game Launcher (Flatpak version) when running Renpy games), but I doubt it.