First, Spoiler Warning.

Let me say it started off really strong and I really liked it.  

Festival of Greed was amazing (9/10).  Fortress of Wrath was OK (7/10).  Eternal day of Sloth had serious problems (4/10). 

The positive thing about Sloth was that it introduced the concept of demon achors being inside people.  Really interesting.  However, the way Sloth implemented it did not make sense at all.  With the people of Mountainreech being dead, the dead bodies could have been basically the same as artifact anchors.  Also, while you might say that the person replacing the rocks in the mine was slothfully avoiding a real solution, it's hard not to argue that good habits are a way of defeating sloth (so I don't see why that person deserves a demon portal).  

My main disappointment, however, was the lack of exploration into how the Sloth demon works.  I was expecting the demon saying something like "these people wished to die, and I granted their wish", but all I saw was the little girl summoning stuff to protect a demon she didn't understand.  The only thing stopping it at the end was Aura threatening to take the life of the little girl, and I think Aura could have done more to truly convince the girl.  

I hope the Belphegor scenario is just a small dip in writing quality, and not a trend.

You have something really good going.  To me the strength of the game is in the demon realms and exploring their flawed values.  I do look forward to what you do with the other demons.  Veradeux seems like it's ripe for Lucifer (Pride demon), and I do see a whirlwind for Leviathan (Envy demon).  I look forward to seeing their phlosophies and how they enter the realm and the hearts of the people.  I think, for example, a child beauty pageant would be quite approprite for Asmodus's realm.

Thanks for reading!