Oh, I just found the solution nevermind. If someone else have the same problem, it's because my headset is set on 5.1 in the realtek panel and my earphone are just stéréo, so you just have to change that.

thanks, so what do I do? get some speakers?

I have a MacMini 2018 (Intel i7, macOS Monterey) with an external audio interface (Focusrite Saffire) and I have the same problem - sound but no voices.
When I switch the sound source to the internal speaker or to the monitor speakers before I start the game I can hear the voices in the game. Then I have to switch to my audio interface when the game is running and then you can hear the voices. I have to do this everytime when I want to play the game.
It's a weird workaround and I don't know if this works for everyone.

I've been working on the same problem using macOS Ventura.

Like the previous poster, the voice audio specifically seems to work when I select my internal speaker or my Studio Display speakers. If I open the game while my selected system output is my typically-in-use audio interface (an Audient iD14, in my case), then the voices are never audible. And, unlike the previous poster, if I open the game with one of the working outputs selected, then switch the selected system output to my interface, the voices don't become audible. Quite a drag.

Daedalic seems to make some beautiful games that tempt me, but I can't buy them if I'm unsure whether issues like this occur library-wide within their products. And the issue seems rare enough that the answer to that question doesn't seem available.