Actual situation:
Batocera, in its menus, provide a section to download more content.
I suggest to provide more FOSS games, like:
* Minetest: Similar to Minecraft, but FOSS and lighter
* Hedgewars: Similar to Worms
* OpenTTD: Simulation game based on Transport Tycoon
* Teeworlds: A multiplayer battle game, with Team Deathmatch and Capture The Flag, but on a 2D platforms
* The Battle for Wesnoth Project: A turn based strategy games
* Shattered Pixel Dungeon: Roguelike RPG, with pixel art graphics and lots of variety and replayability
* 0 A.D.: A real-time strategy (RTS) game of ancient warfare
Best regards.