What’s great about this one is that there is support (like firmware upgrades) and you can actually get other games on it (unlike all those other mini-console cash grabs 
).
I’m expecting to see a screenshot of a particular game soon!
Here you find a description of what flags to use in filenames (e.g. some games need the joystick in port 1), or the syntax of CJM files (you can map specific keys to joystick buttons for instance):
https://thec64.com/file-loader/