For anyone that has Hex Gambit: Respawned beta access: I just tested Remote Play and it works great for live online matches!
If you and a Steam friend both have HGR launched, right click them in your friends list and invite them to Remote Play.
You’ll all share the mouse and keyboard for your turns. The first controller that’s connected is still considered P1 by the game no matter which computer has it (that’s just how HGR does controllers). Additional controllers that any of you connect are P2, P3, P4, and those don’t share control with anyone. That’s important for the controller assignments on the setup screen.