While you're waiting for a GoG native client, I can whole-heartedly recommend:

Heroic Game Launcher: https://heroicgameslauncher.com/

RPM/Deb/Flatpack/TGZ/AppImage for Linux

DMG for MacOS Intel/M1+

EXE for Windows

Heroic supports GoG, Amazon Luna, and the Epic Game stores.

Heroic even streamlines the app updates so you don't have to figure that out.