Click the connect to server button to join the game, and if a slot is open you will be assigned to either Player 1 or 2. If no slot is open, the server will reset to make room for you. Once joined, click and hold down the mouse where you want to go, and use the buttons to communicate with the other player. If you get kicked to make room for someone else, please be courteous and let other players have a chance. :)
I actually made this a long time ago, but today I remembered it's existence, made a few improvements on my original design, and shared it. It's really basic, as I didn't understand back then about condensing multiple values into one cloud variable, so as a result it takes up all 10 cloud variable slots and only supports two players at a time. I don't know if I'll ever optimize it or use it for anything, but here it is for anyone who might be able to get some use out of it. :) Gamepad icon in thumbnail credit to Sergui Bagrin on flaticon.com http://www.flaticon.com/authors/sergiu-bagrin