definitely going to try it with some friends. But it's true that at first I was checking which games I could connect to, or how it worked without reading anything, and thought it was to connect to some multiplayer games of steam, and gaming couch acted as a layer to use phones as joystick only.
Ah right, I see what you mean. For that specific purpose I remember seeing some other software like Virtual Gamepad and Remote Gamepad that should let you use your phone as controller for Steam games. Haven't tested those out myself though