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The plots of Portal 2 singleplayer, co-op, and PTI are very “distant” from anything happening with Half-Life.
From what I understand (it’s been a while since I read up on the lore), Portal 1 and 2 take place after the Combine invasion of Earth, shortly after the first Half-Life game. That’s why Aperture Science is almost completely devoid of life, minus the personality cores that are attempting to continue running things. It’s because of the resonance cascade incident at Black Mesa that Aperture Science is now mostly defunct, and Chell is trapped as a lab rat at GLaDOS’ mercy.
So the Portal series is pretty reliant on Half-Life’s story to justify their plot, even if it’s never directly addressed in the game itself.
Epic just recently announced that they’re never releasing it outside of their store. They’re the exclusive publisher, so they have distribution rights, and their CEO Tim Sweeney is determined to snub his nose at Steam, even though Alan Wake 2 still hasn’t earned back its production costs. It’s a complete flop, but they won’t extend to the Steam market to help sales.
Unlike other games, where publishers sign exclusivity contracts with Epic Games for a certain time period, Alan Wake 2 was actually published by Epic Games, meaning that Epic Games gets to decide what systems the game releases on. So it’s not coming to Steam. Which means I’ll never get to play it, because I’m never giving a penny to that awful store of theirs.