Guess I'll voice an unpopular opinion.
This manga is a tech demo marketed as a full game.
It fails to get you to sympathize with any of the characters, especially that one psychopath flawless genius who solves every problem seemingly effortlessly with a smirk and seems to always be having fun.
There is an interesting premise of 'a glitch in reality', and a few mind-entertaining ways to exploit the world mechanics, but no real suspense, drama or character growth.
Overall, a disappointment.