It's not Linux's fault. Everything is run underneath Proton/WINE. If anything the WINE prefix running the game is lacking a proper codec, or something isn't configured right, even Steam could be messing something up. And it's worth to note that:
https://mrdrnose.itch.io/votv/comments?before=1507
https://mrdrnose.itch.io/votv/comments?before=1751
This isn't an isolated incident. Assuming from their comments, they're playing on Windows.