Rebrand
The "Games" name and general presentation of this app make it seem a bit too mainstream/product-y for an app that doesn't do much unless you provide your own ROM files, and doesn't even tell you how you could get them.
Seeing as there's nothing we can do about this, I think a better alternative would be rebranding the app to something that looks and feels less like a core app, and more like a niche third-party thing for enthusiasts, more akin to a Torrent client than the Photos app.
Of course the app could and should still follow the HIG and integrate with the system, but the name/branding could be changed to reflect its status as niche third-party app for enthusiasts.
This would also help with name collisions with the GNOME Games collection, and with people confusing it for a core app.