This is the design (pdf):
Rise at ZeroThe core idea is basic simple: take the Battle Royale genre... invert it. On a large map you don't have just survive by crafting during an apocalypse (planet wide collapse, but the arena develop in a restricted area), you have to make sure NO one else die.
Each time a fellow player dies, difficulty scale up as the apocalypse grew stronger and games turn into a "no return point" where victory is not possible anymore.
I leave the document for the details.
If this genre (only one spawn, battle royale scale arena, (simple) crafting of build and structure, do not allow other players to die) can be suited in other categories (definitely its not Battle Royale: there are no guns, but only tools to survive/stealth/heal/protect and various skills).
I know (original) Fortnite was intended to something like "protect people"; but that was more like a tower defence with waves and stuff.
Also, in this concept there aren't "people": all players are android, and they are the only humanoid thing still on ground.