This guy's too humble. He's Matheus Valadares, and he's the creator of Agar.io [1]. This is the game that pretty much started the ".io game" genre [2].
[2]: "Around 2015 a multiplayer game, Agar.io, spawned many other games with a similar playstyle and .io domain". See https://en.wikipedia.org/wiki/.io
[1]: https://en.wikipedia.org/wiki/Agar.io
[2]: "Around 2015 a multiplayer game, Agar.io, spawned many other games with a similar playstyle and .io domain". See https://en.wikipedia.org/wiki/.io