I appreciate that you aren't doing the "WOOSH, BANG, CLASH" thing. I might actually enjoy it if I could be bothered reading it.

Alright I understand. When can we expect the rewrite to be posted?

This is rather interesting... I'm quite interested in what pairing you will have. Also... What species is the OC? We didn't really get any sort of description about the OC. I assume it will be in the next chapter?

Writing level is one of the best. But... the MC feels emotionless and this chapter feels way too rushed. It's the most interesting part seeing how he reacts and adapts in the first days (But it got completely skipped) not to mention... how the fuck did he come up with the idea to create a city? (When he doesn't even know what era the beings living in this world are, not to mention... he doesn't even know if there ARE any humans or any intelligent beings at all)(He doesn't even know if they are the only living humans or are there other PLAYERS, he just randomly decided that it was a good idea to build a freakin city? (What type of city will he build? When he doesn't know the era he is in. Perhaps they have freaking SCI-FI technology and he is going to be building a freakin hut from the prehistoric era.) You have potential as a writer but you should really focus on the story that your MC sees. Because we don't know what is happening inside your head. You should be writing the story like you would be explaining it to autistic children.

Now this is a cool concept to alter the events of overlord setting it way before Ainz. I was looking for a story like this and I hope I won't be disappointed. Its a great first chapter I hope it will only get better and more interesting as it goes.
And as always...UPDATE.

Your mc seems to express little emotion, but otherwise the concept of how one can influence the world of ovsrlord is a cool idea, especially because you are set 100 years before canon.

How will your mc face the remainder of the 13 heroes? How will he influence the growth of the human nations? And most importantly, how will this set them up for when the absolute brokenness of Ainz Ooal Gown descends upon the world?