I am redoing this review since the 5 book series is completed and I have read them all. I classify this as a portal litrpg 4x. The 4x is base/civ building similar to some mobile games or computer games.
Each book feels different from the one before it. For instance, book 1 is mostly a normal litrpg, then ends with base building, while book 2 is heavily into base building and military campaigns. Each new book also focuses on a new side character. What's interesting, is that later in the series, two of the characters I cared the least about, became the most interesting, to the point that I wanted to read more about them than Connor.
I give this whole series a 5 out of 5, and it has a wonderful ending.