If you’ve read literally any other work of the death game genre, Kamisama no Iutoori will offer no extra benefit to you.
The story is very, very basic. Very little is actually explained about what is going on, so it seems that the main attraction really is just “people dying stupidly”. Said people being generic mob, with very shallow personalities – and that includes the protagonists too. I was given absolutely zero reason as to why should I care about any of them. There is at least some attempt to differentiate between characters by varying character designs, but that too falls flat as most of them are as randomly introduced as they are killed off soon after.
The death games themselves are boring, and beyond the concept of turning children’s games into death games unimaginative. And it gets worse with time, last volume being the most boring of them all. There just isn’t anything to catch your interest unless this is first or among the first more explicit manga you’ve read. And it’s not like the art of that is any great. As is the story, the drawings are also subpar, with maybe one or two pages being alright.
There is also a sort of subplot with moe manga and annoying otaku character and it is the stupidest shit ever that only adds to the story not making much sense together.
Maybe all of this is explained in the sequel, but this part lowered my interest in reading the continuation for it quite lot, so I’m judging it as it stands alone, and it’s standing alone is terrible.