I mean EndeavorOS can install the same gui package manager as Manjaro has, pamac.
Game support usually comes from using packages you need and those packages being up to date to support latest changes like fixes.
Am a long time EndeavourOs user, quite happy, it allows everything i need and pacman never broke on me… cant say the same about apt, when using non-standard repositories (for some up to date packages)
And the AUR is awesome. Has many packages not found in the normal repositories, just some have to be compiled which can take a bit of time, but i dont have to fiddle with it.
big reason why i switched to kopia, borg just doesnt cut it anymore…