I am no Lv 6, I am not a professional reviewer, I just read the thing so far and I found a few things that could be important to note before reading.
This story is a cliche of OP mc, it's like the Chinese ones, where MC is an op cultivator, who returns to earth, but in this one he doesn't return to earth, he is just reincarnated there which also happens in many other novels.
For this review, I'll go over my reasons for star ratings to simplify it;
Translation Quality - 2 Stars; The quality of translations is alright grammatically, it's not terrible, it looks like a high school freshmen paper, which is okay for a novel, Rome wasn't built in a day and this isn't professionally written even natively. Though there is a major discrepancy everyone notices right out the gate of the first chapter. The novels spacing has no point, every sentence seems to be cut off from each other for no explainable reason, do they just not want to use periods?
Stability of Updates - 5 Stars; This is because so far, the updates are coming at a steady rate that is enjoyable for any regular reader who doesn't harass the author/translators to hurry up.
Story Development - 3 Stars; The story hasn't developed much so far, but I understand some criticism of my comment that ill state myself, it hasn't had time to develop. Maybe it is a slow-moving development, possibly, but most unlikely sense these kinds of novels never really have story development, its more akin to a power fantasy.
Character Design - 2 Stars; Exactly with the story development, our MC doesn't change in any regard, he's just as ruthless, and with the author being a human and not innately a demon, you can still see things that in mind, a demon would never do within the story. You may say "Oh but he's changed now"? Why would he, we havnt seem him even talk to the original host's family. This is just a thing of the author not being in the mindset to write a demon as a character, and should just stook with the MC being a past 'demonic' cultivator, so it could explain why theres still human aspects to his personality.
Finally, Word Background - 1 Star; You cant picture this world if you were a new reader to novels, and don't say 'A new reader wouldnt find this' oh yes he would, at time of writing this is the #10 Top Translated Novel. The worlds not shown, it's like a 2d plain, 'He comes out of a river caught by an oldman' , if you were to imagine while reading an overly complicated way of saying exactly that, you would just imagine a river with a old man on the bank of it. Is it a high bank? Is it a grass bank or a sandbank, why is the old man there fishing in a river? If he's rich why isn't he fishing in a pond that could be easily installed? There's no rhyme or reason in this story.
All in all, this story is without reason and is just another power fantasy, if you liked one punch man, just keep reading one punch man, a new chapter comes out almost daily, sometimes there pauses, but you can re-read it. There's a lot of novels better than this one hidden in the Fan-Fic section, and I can understand if you read this anyway, I'm just giving my opinion on the story, its another Chinese power fantasy that will be drowned out by next year, when either the chapters are finished translating and it goes to the backboard of top #100 only being read by new readers, losing its initial drive, or the translators will stop translating, people will ask for someone else to pick it up, a few months to a year later they do and drop it again, for this story to only be lost in time.