How to make the game play screen increase as the player object grows?

I mean, how to do that camera effect that exists in Agar.io, where the more the player increases in size, the more the screen 'deepens', preventing the image of the player disappears on the edges of the game play screen?

I have tried with the Set layout scale: (layoutscale - 0.1), modifying the values, but it never works. Below I leave the game where I want to apply this effect.

Dropbox game link: link