In the next part of this multiplayer game tutorial more gameplay mechanics are added allowing bigger players to eat smaller ones.
"This is a continuation of a multiplayer game tutorial series with Phaser.js. We’ve implemented an authoritative server with the help of p2 physics in the server. We have some basic player movements, but our game is very boring at the moment.
In this part 3 tutorial, we’ll add some agar.io mechanics into our game. We’ll give the bigger player the ability to eat a smaller player to become a bigger circle."