This was a really fun read. The theme of the book comes through really strong every step of the way, it's obvious you had a clear picture in mind when it came to the concept. All of the art is very charming and feels like a great fit. The description of each of the guilds really gave me a good picture of the culture. I quite liked the bit where "children" was crossed out when it came to things the gnomes traded for, that got a chuckle.
The title page says that it's written by gremlins, but most of the book seems to be written by gnomes since they refer to "we" many times.
I did notice that the Gnomovoi were called Domovoi in their actual description.
I like Grief as an idea, but I am not sure when I should give that our or let players resolve it as a GM. I could just wing it, but it seems a little amorphous compared to the other rules.
Overall, a really great read! I think this would be a lot of fun to run for a group tired of the solution in games being to beat something up.