https://steamcommunity.com/app/1867240/discussions/0/573792728906914951/?ctp=6#c588434795636287991
https://www.protondb.com/app/1867240
There will be one more playtest from August 21–23. To receive an invitation, register via Steam or player.gg
https://x.com/HowardPhilpott/status/2082040132425650683 - steam deck gameplay
Actually good question as they apparently are using an altered version of unreal engine (https://www.wardynamics.com/) UE has linux support, but maybe that got lost in the changed version.
Default voice chat stuff in ue is windows only so would need to be redone from scratch (if they using that).