Thank you both!

Yes, there is a novel (WIP) that takes place in this world, but the world was there first, and the story isn't finished yet. The base idea for the story - and for the world-labyrinth - was inspired by an older artwork of mine from 2006 (that "ink on paper"-map might be a little bit older then ...), but I didn't start working on the novel before 2011. Unfortunately I haven't even worked on it for several years, but I still plan to finish it some day. It's german though, just like the background information on my outdated website about this project.