SteamTinkerLaunch – an awesome wrapper for games played through Proton – is now available on Flathub. Seems like the link isn’t available on Flathub directly, but you should be able to install the app with:

flatpak install com.valvesoftware.Steam.Utility.steamtinkerlaunch

Great news for you Steam Deck owners! Or for those of you who primarily use Flatpaks as your applications. Check out the overview of SteamTinkerLaunch on Boiling Steam.