So, at first the game didn't load because of some PSN dkms BS... After I entered the command SteamDeck=1 %command% into Launch Options, the game did start in a black screen though, with a message like "Waiting for service confirmation" or something like that... I've tried installing KDE and GNOME but no success. As idiotic as it may sound, all I did was log in to PSN in firefox, i don't know how and why, but it made the game launch as expected.

I'm using Arch with Hyprland!