Found my old itch.io just so I could comment! Love the concept and the world building you've got going on. I must say that I liked it when the supposed 'author' of the book adds a personal anectodes i.e recalling how someone killed an adversary. I think without some personal touches like those, it'd just seem like an info dump but with those little additions it adds life and maybe even allow yourself to imagine what kind of person would be able to survive and chose to stay in Yerrick; assuming they could even leave
Would also love to see the devils part get expanded on if you make a sequel, like maybe an anecdote of an encounter with one and what a specific adversary reacted like to it. Them being described as just 'friendly, silly fellows' does make me wonder if there are more to them and that's just what the author thinks, that there's something more that lies underneath. I have a few theories but I wouldn't want to spoil the fun as filling in the blanks yourself as the reader is more fulfilling.