Switch games that allow free remote play?

Almost no games on Switch have that feature.

But you can game share digital games between two Switches.

The person that owns the digital games has to make the other persons Switch their Primary. On their Primary Switch, any account can launch their games. That makes the game owners Switch a Secondary. On the secondary Switch, only the account that bought the games can launch them, and you need to be connected to the internet to do a license check.

This way, both people can play one persons games at the same time, each using their own account. You can even do online multiplayer (Not LAN or adhoc) with each other this way.

Me and my son share all my games this way.

/r/NintendoSwitch Thread