Okay, let's talk about the apocalypse, right after I post this dial proposal for the "special effects" in the game.
A dial and checklist to set how crazy the future is.
(brief recap: L0 is information/data; L1 is the physical world; L2 is the internal mental world; L3 is the alien world)
This dial is to determine the limits of shared experience (crossover at Level 2):
Rating
R-1 No sharing of Level 2. This is rated –1 because it is boring and you shouldn't pick it for your game. If the alien culture begins to destroy human culture and doesn't offer any profoundly new experience to humans, it would be a pretty clear fight, like WWII. This game should be like the Cold War and the War on Drugs combined.
R0 Level 2 experiences can be reduced to data (Level 0). So, recordable sense-info, stored digitally. Memories can be recorded and played back later. Like the dude who, after breaking up with his girlfriend, just wallows in his recordings of them having sex all day every day. This also makes skill chips possible, and HUD displays, and being able to access nodes that are somebody else's experiences and memories, or accessing nodes that are recordings of your own experiences.
R1 Remote viewing of Level 2 is possible. You can have avatars and other bodies and stuff and your mind/perceptions is mobile throughout Level 1 (physical reality). If this is all psychic and mystical, you probably can't record it and have Rating 0 stuff. If this is technological in nature, I don't see any reason why it wouldn't be recordable. If you're remotely controlling another body, the signals going between your two bodies have to be reduced to information, and that can be saved for later.
R2 A person's Level 2 becomes a navigable world, and ideas become concrete. So you can insert your Level 2 into someone else's Level 2. This is like Inception, The Cell, uhmm, what else? You can make an argument for mental realms that aren't one person's mind, so like The Matrix or the astral plane, as well. If this is totally psychic, you might not be able to get Ratings 0 and 1. If this is tech, you should be able to record it, though I can see a situation where you still can't project your mind into a physical avatar, just a dream-avatar.
R3 At this rating, direct telepathy and mind-meld are possible. This is rated at 3 because it is part of the apocalypse. Once a few dozen people can transfer their brains into the body of a giant squid and share their minds in one body, they become antithetical to normal human civilization. So they are one of the destructive elements. Much like the singularity happens and overnight civilization is unrecognizable, or whatever. They might be much, much happier, but we here in normal-land cannot understand them and feel betrayed and abandoned by their departure. If this is psychic, like the scene in Zardoz where the guy yells "No! I will not join you on second level!" there might not be avatars—although in Zardoz they were able to play back Sean Connery's memories on a tv screen, so there was some recording going on there.
That's still a bit awkward, but I guess it sorta works to set what kind of interactions are possible due to advanced human technology, and contact with the Other, the alien civilization that precipitates the apocalypse.