I like how MC fools everyone. He is a very witty chum, alright. But I fear MC's powers and intelligence suddenly get nerved as soon as the villains make their debut.
I wouldn't mind a one-sided slaughter. Some mangas already show, that an MC, that is nearly always winning and destroying one enemy after the other, does not have to be dull. I know, it shouldn't be that way, following the rules of dramatic theory, but it somehow never gets old. The more 1D a villain is, the faster he or she should be dealt with.
I hope this story doesn't go into that direction, in which MC starts out strong, but later gets constantly fooled by everyone and just hangs in the ropes. Those suck. I know why they come to be. "We need a strong obstacle for the MC to overcome or the story gets dull." And just before or after that obstacle is overcome, "We need the next obstacle to keep the readers thrilled, but MC has to struggle even more." Rinse and repeat. The problem is, that at some point there is no space to grow for the obstacles. Then most authors nerve their MCs with the naive thought, "If I pull it of right, the readers get the impression, it is the villain, who is that tough.", but in reality the only thing the readers notice is, that MC get's dumber and dumber and weaker and weaker.
Come on, here is the lineout of a likeable isekai/fantasy story: Let the MC start out with some advantages (if you want to empathise on growth, let him start in a weak position, but let him use his advantages to climb the ladder), then let it get easier and easier for him to win (if you want to add drama, you may fool the reader for a short amount of time, that he had been had, but then ->all according to plan<- and comeback.) and see how it goes. Maybe add ONE challenging midboss, that poses a real threat (,but not as big as the bigger initial dangers MC overcame). In the end set up a big battle with an endboss, that is as hard to overcome as obstacles in the first few chapters, draw it out a bit and let MC win. End the story. 5 mainarcs and 5 short fillers over the cause of 100-150ish chapters, including an 35 chapters Endboss arc.