In the Fedora Games spin, it comes with games, however there is no software or application where you can easily browse and find games and applications.
Snapd or using snaps is a great way to install software like these, and using gnome-software and repackaging it with changes to make it a game lab, is perfect. For example, if Minecraft could be an option, that would be great. Same for games like 2048, Pybik, and others.
So, just an idea, because when I tweeted to the project, they responded saying We have a games lab ready to go and it was really just a spin that came with a bunch of games with the XFCE desktop.