The kiddo on the left fires guns and unleashes special attacks while the kiddo on the right places shields and doles out splash damage via projectiles.
Apparently, the judge felt this was the best way to break him of his internet addiction, and also recommended that the kiddo receive treatment for his online gaming obsession.
According to the production notes, the kiddo is simply consumed in the pixelated universe, and strives to "always being the best, " regardless of the real folks he ignores in the process.