Alex was an ordinary person with the dream of one day being transmigrated to a magical world.
But what he didn't expect is that he would be transmigrated to a world much more than that, a world he knew very well, but instead of being given a system that would empower him, he was given a system that allowed him to make games, and the more people played, the more powers he would get.
Tony Stark: Son of a bitch, I can do in real life everything this Watch Dogs guy does, but why can't I stop playing?
Hulk: HULK HATES DARK SOULS!!! HULK SMASH DARK SOUS ARRRHHHHGGG!!!
Nick Fury: If any agent can't complete the Hitman game by next week, that agent will be fired from the Shield!
A world of superheroes, but who controls everything is "only" a game developer.