I’m very new to this I thought the point of it was that all the decentralized bits are still linked. Do you mean there are duplicates of communities that are just named slightly different or what?

Super time force ultra is a side scrolling shoot em up with heavy time travel that is like speed running with yourself and saving and cooperating with time travel versions of yourself. I’m not sure if it fits what you’re looking for but it’s a lot of fun

May I introduce you to the Sega Saturn library. A lot of it is arcade style games, many of which can be beaten in 2 hours or less, but replayed nearly endlessly