Once you install a game through heroic there is an option to add them to the steam home menu where you can launch them like any other game steam game but they still have to be installed through heroic first. However, heroic can be launched from the home menu as well and has controller support.

There is also a decky plugin being developed that integrates epic into the home menu but it’s still in testing and was just posted about today.

There is an audio crackling bug in the latest firmware. Doing a full shutdown and restart fixes it for me.

Wow is a bit of pain to setup but it runs and plays great with the consoleport addon. FFXIV also plays great and is much easier to setup. I haven’t tried them myself but I’ve also seen ESO and GW2 being played on the deck as well.