Interesting concept and a great art style I like it, but I suggest adding a single-player option (Although is better to play it in multiplayer).
Great game.
Nice looking game, however, the player sprite gets stuck in the last animation until you make another action.
for example:
after jumping or moving, the animation will remain the same until you make another action (the moving animation will keep playing after the player stops).
and it would be better if you flip the sprite when moving to the left.
Good work!