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Might want to check this out for multi controller. Best of luck
https://steamcommunity.com/sharedfiles/filedetails/?id=239373369
https://www.youtube.com/watch?v=pbtgDfZTSYo
Portal 2 is not a mobile game, means there no mobile version of the game.
What you're doing is streaming the content to your friend, just like Nvidia GeForce now, PlayStation Now, Xbox cloud, or etc, if not sure what those services are, then put it simply, you're sending video feed to your friend, and your friend sending input from his/her phone to you to act on your PC, if that helps you understand.