idk it was pretty bitter that the guy basically died. Plus they're trapped in this universe of assholes >_>.
This. The surviving cyber-people looked happy at the end because previously they thought they would either die or face eternal torment, and they're just glad to live a life where they can explore an infinite virtual universe relatively free. They still can't ever leave the game, and their old lives are forfeit. Hopefully (and probably) they will find some way of contacting their real world counterparts so that their lives can be preserved digitally (and ended when it's their time).