The tale is becoming very convoluted and the brother seems more like a very sketchy patch over the plot holes then a real character. His abilities are too overkill, derailing the plot even further instead of helping. I miss those well-thought mystery plots instead of OP "detectives" pulling...
While it's nice to see the characters in visual form, the manga is a very poor substitute for the web novel. Things happen too quickly, the plot became a mess and there is no sense of pressure whatsoever. Snow/Lute was way better and funnier in the web novel, and even Meya was a deeper character...
How did they kept the language intact so they could be understood thousands of years later? That would be possible if they had just waken up some years before the beginning of the story, but if they were the last of humanity for thousands of years... It would be worse than trying to talk with...