The game supports Steam Remote Play Together. One player is required to have the game installed, when the game boots, this icon will show up indicating how to proceed (in the bottom right corner)
Just invite a friend, and Steam will recognize the input from the guest and share the game screen from the host.
Note that the guest player might need to use a Gamepad or Steam might not recognize the input.
Now is time you both enter again the world of survival horror!