I like the story, but it is true that I would have liked more that he had been acquiring strength little by little, not that in the first chapter he became the most powerful on the planet.
what most author don't realise when MC becomes too op, they auto kill the novel. As from now, the later chapters will look too forced or meh. Everything else will become boring and not enjoyable. Then Author will either dropped or rewrite it because there will be nothing interesting left to write