There is already apps working on the same principle. iirc I played a game like this 1 or 2 years ago, but it was a turn based game. Very fun to play. Also, this

There is already apps working on the same principle. iirc I played a game like this 1 or 2 years ago, but it was a turn based game. Very fun to play. Also, this game is very nice to learn web socket, the code and flow is easy to understand.