Balur
It would be great if PICO-8 support were also available. It's not a real console, but a fantasy console, but it brings a retro vibe and thousands of games are already available for it.
https://www.lexaloffle.com/pico-8.php
I don't have any precise information about its technical implementation, but in addition to the official binaries, there is also a RetroArch core, and there are iOS and Android repositories on GitHub.
https://github.com/jtothebell/fake-08
https://github.com/jevonlipsey/pico-ios
https://github.com/Macs75/pico8-android