Shit, the branches are falling

This is a simple arcade game made for school. You have one button and you only use that one button. 

Player 1 : Z

Player 2 : C

Player 3 : B

Player 4 : M

You press the button to join the game if you're in the menu and to switch side of the tree if you're the playing. Everybody has to join for the game to start. You can also quit the game with escape. 

That's it , have fun!