How about This War Of Mine? It's a hella good game and it's very original.

Maybe it would be possible to create an arcade like dungeon stages like Aincrad (SAO) but in a smaller version, like very big battle towers with with economy of it's own and edited objects and enemies, it would be cool to play that. It's a huge idea, but maybe with world edit it could be done and I...

A SAO based dungeon with bosses and a lot of different fighting tests.