Hi,
Seeing little development on the launcher and the official image (which seems stuck on debian stretch or buster, let’s hope that changes! 
) I’m looking at batocera which seems to be a solid retrogaming distribution.
Looking at the download page Batocera.linux and the wiki page for hardware supported choose_a_single_board_computer [Batocera.linux - Wiki] I can see keywords in common with the gameshell architecture (mali, allwinner, armv7l, etc.) so there might be some overlap.
As far as the low resolution is concerned (320x240 in our case), it seems that it could be supported since the Retroflag GPi Case has this resolution see the wiki choose_a_handheld [Batocera.linux - Wiki]
Does any one know how one should proceed to run / test / develop a version of batocera for the gameshell ?
I’ve posted the question on their forum to ask the same question, will post the link when the post gets approved.