Well the app is currently in the earlier phases of development but i think more people should know that there is currently an attempt at porting slide for reddit to lemmy. here is the releases from the repository https://github.com/bqv/slide/releases, but its very early in development
that works as well, but there is a linux client called heroic that works for both epic and gog which helps makes things simpler for setting up the games to work, so i think that would be easier than using proton or lutris