Great game, i really like this type of games, but unfortunatly i can't play it with my friends because of quarantine.
but i found 2 problems when checking this game alone.
first when i entered the game (as a keyboard and controller) played two games, exited to menu, checked how to play, and then went back to game start screen, player 1 window disappeard (look on the picture belowe) i had to restart the game.
second, game lacks one key feature, or atleast idk how to activate it, you should be able to play few games in a row without exiting to menu after match ends, matches are too short for that, maybe implement a round system, in which you can set amount of rounds to play, and the winner will be one who won most of the rounds?(i know it's a demo, and i understand you may have more important things to do)