Like as far as writing quality in general, art, characters, etc it's all quite good, but the whole "dungeon ecology" stuff being retconned away with "actually it's all eldritch horror wish magic so all that monster ecology stuff is fake bullshit that doesn't matter" kind of sucked as a core plot point, as was downgrading the dungeon lord from "scary ancient mage who knew how to make such a big and complex dungeon" to "just some dumbass who didn't understand the most basic things, and it was all just eldritch horror wish magic doing the heavy lifting." Making a core point of the wish magic "greed and cruelty are harmless and normal, but wanting to improve the material conditions of others? That's a serious moral hazard that feeds a world eating demon!" is some peak liberal bullshit, too.

Also I hate the narrative device of "this arc has reached it's climax and finished and we've wound it all down now, time to move on to the next-PSYCH lmao I take it back it's not done I'm undoing it now it's still on we're still doing the thing that just finished lol" because it's lazy and ruins tension and pacing compared to just finding some better way to segue into a new arc. Especially since it doesn't even really do much of anything with the retcon, and it was practically just an excuse to get rid of the timer they had and replace it with a different one they didn't know about.

Apart from those things it was all good enough, though.