I checked just now, Syosetu listing was pulled entirely. And apparently migrated to Kakiyomu.
You can tell by the singular upload date of "Feb 27, 2021". They deleted and moved it entirely when completed.
I think the final "Amy" side story chapter earned a lot of flame comments, due to the way Syosetu separates R15/R18.
It's not so much of a spoiler, as futher indication of genre shift/sloppiness/lack of focus by the author, IMO.
Referring to my original comment: I felt this story went off the rails in the second act, with Deus Ex Machina.
I more greatly enjoyed the underdog "exploiting a buggy game" aspect we had here in the first act.
- My LN recommendation instead: "Only I Know This World Is a Game" by Usbar. (The WN/LN, less the Manga.)
It is much more on-topic and focused. Has good arcs. And ending. Usbar has a lot of experience writing.
- My second LN recommendation in this vein (also by Usbar, surprise surprise): "I'm Not The Hero!". (The WN/LN, less the manga.)
It is still in progress, both WN and LN. But it also adds the elements characteristic to Usbar works.