In his latest podcast Daniel demonstrates how to root TheC64 Mini and change and or reorganize it’s games. He also shows you had to launch other games using the built in launcher.
The process starts off with rooting and obtaining access to the core of the system. To start with that by adding pin header for serial connection and a  USB to serial adapter. Then terminal Putty and finally Root access and making a backup of the original media on the device.
Once that’s done he explains how to use Vice to create snapshot images of the software you want to install and adding photos for the launcher. Creatingthe game info file and finally copying that content onto TheC64 Mini.