Like me, I imagine you were a bit confused seeing this game get an update. I don't normally make guides for games, but I thought what the dev did here was pretty cool and I want more people to experience it.

Starting PVP is incredibly simple.

• Step 1: Click play on the main menu. This brings you to the area with a bunch of birds and a sword embedded in the ground... DO NOT TOUCH THE SWORD! As probably everyone already knows, this starts the regular game.
  
  
• Step 2: Run around like a chicken with its head cut off until you find a bird that doesn't fly away from you. If you're suspicious of a bird, wiggle your mouse around on top of it and see if it starts glowing. If it does, right click it. It won't take too long to find, don't worry. (Example of the glowing bird below)
  
  
  
  
  
  
  
  
  
  
  
• Step 3: Right clicking the bird that glows will send you to an arena. Now that you're in, you can queue up in the bottom left, or just enjoy the spectacle of two biblically accurate angels shooting each other with lasers and flaming skulls. (Showcase of the PVP menu below)
  

Anyway, I told you this would be short, have fun! :)