For the writing quality, it was really good. I didn't notice any errors but that was probably because I wasn't really looking for them. I haven't checked this book long enough to see the stability of updates, so I'm giving it a 3. The story development is really good, but I think it can improve a bit more. For the character design, I think you can describe it in a little more detail to get an image of how the characters look. Lastly, you didn't give much for the world background, so I couldn't really give more than 2 stars.
This is my first time writing a review, so I am sorry for all the criticism I wrote or if I may have offended you at any point. The story you wrote is really good and I can't wait till you update more.
keine1120