RMG ProtoArcade
Two player co-op games. One of you sees one half, the other sees the other, and you talk.
How it works
Open a game and press Create a room. It gives you a four letter code. Your partner opens the same game, presses Join a room and types the code. You each need a screen, and the two of you need to be talking: a call, or the same table.
Nothing to install, no accounts. Most games have a practice mode to try alone first.