Hi, I'm kinda new to reviewing stuff (actually this is my first one), as there are no reviews of this manga at the time, I'm here to fill this empty space.
WARNING: SPOILERS AHEAD!!

Story: 5/10

Considering how short it is, I guess the story is OK I didn't see any real meaning to the whole story when it came to the Room. It just seems like a convenient way to set a stage for the author's ideas. Or maybe all stories are like that? I might be being harsh here, I don't know. The plot twist was fine, and I also like game over endings, since that doesn't happen very often these days.

Character: 7/10

In a weird way, the characters are more the story than the idea of the Room. What I mean by that is that the characters all have kinda interesting backstories. I particularly liked the gamer guy who died super early. He thought he was gonna be a hero and got eaten so fast (lol) (wait that's not funny...) Most importantly is the brothers, wherein a plot twist, we find out who the real murderer was. I thought that the murderer's reasoning to kill his brother's wife was a little shallow. Seeing how rational he can be (making that plan to kill the monster), yet so irrational at the same time, it is kinda interesting but doesn't make sense to me. Then again, the guy is delusional apparently so maybe it doesn't need to make sense. Lots of the character decisions are questionable but it's really hard for me to say that they were impossible since I've never been in that sort of situation before. But being "brave" enough to kill yourself but not brave enough to at least try to stab the monster or maybe throw the knife at it, or beg to the guy to not shoot you seems to be more favourable. (Quotations on brave so no one gets the wrong idea, just lack of a better word.)

Art: 7/10

It's not beautiful or anything, but the art gives off that creepy atmosphere really well which is perfect for the story. The characters all looked fine. Not much to say here, the art definitely doesn't take away from the story.

Enjoyment: 8/10

Honestly despite how unrealistic everything seemed I was sucked in the reading right away and finished the whole thing pretty fast. I like fun and short reads so this was right for me.

Overal:l 7.0/10 Fun read, but don't expect anything heavy or substantial message from it. Just a quick time passer.