If you’re in Europe, it may be due to the DMA.
You may also have noticed something new on Google, when looking for the address of a place: It’s now impossible to click on the map that appears in your search results.
Google is one of the “gatekeepers” according to the DMA (Digital Markets Act). The law recently went into effect. It is supposed to lessen the amount of preferential treatment the big tech companies give themselves.
It does work in Proton, but without audio.
There’s a bug open @ https://github.com/ValveSoftware/Proton/issues/7612
ProtonDB also lists the lack of audio, without workarounds (so far): https://www.protondb.com/app/2512840?device=any
Hopefully there will be a fix and/or workaround very soon; the game looks fun.