Here's the google play link for those who are uninitiated with the retro game app
Android boxes can easily run emulators. You just supply the roms. You can easily download emulators like Retro Arch from the Play Store or sideload. These will work with controllers paired to your Android box.
Tried some of these. Some games the controls are not well planned out. I think the kids will like this install for the most part. Didn't see game pad support.