The video game designer is the one who is in charge of the overall design of the gameplay, the general environment of the game, the characters and the story. Many game designers follow their work in an experimental way and after many tests and errors part by part, they complete and approve each part of the game design

The evolution of video games is really interesting and Rockstar always contributes to this evolution. It doesn't mean that other companies don't contribute. Everyone contributes as much as they do to the gaming industry.