I’m not 100% sure here, but I think ES-DE still relies on having access to all files (External storage permission). Because Google Play does only allow this permission for File managers now, I think that might be one of the roadblockers.

which renders the Setting Button on the tab-bar as a barely tapable micro-button

Ay, that’s bad, sorry about that. I’ll look into that to have that fixed. Out of curiosity: Is the default orientation setting of the RG Cube Landscape or Portrait?

one could select a Roms Folder and the App will assign the appropriate emulator application

Good idea, thank you! I see that this could work as an Autosetup where it simply assigns the emulator it detects. For Retroarch it will be a bit difficult though, because I can’t detect what cores are installed. I wrote it down for future features, but first I’m trying to get rid of issues, supporting more emulators and adding must-have features.