It's good stuff. Sort of a mess, but good stuff nonetheless. Canon? What's that? Canon left the chat before the MC was born. The character design is very well balanced; most of the stuff that I read where the Sukuna golden finger is used, ends up with a deranged-edgy-sadist character, which eventually turns boring after the first 10 face-slapping sessions. But this one didn't, Not to say the character's alignment is 'Good', it should be 'Neutral' with an inclination to 'Egoist', like the guy only cares about his goals but not to the point where he would be using everything in his path to reach said goals, even if it meant losing his morals.
Long Story short, I recommend it! I don't know how the author is gonna deal with the story without the guidebok known as canon, but I'm eager to find out!