Very deep. And very vivid. It's the kind of thing one sometimes finds one "has" to do at times. To step outside the box and one's comfort zone...to stretch one's creativity and grow is sometimes a good thing.
Writing such a story in first person is really very chilling. I do not wish to imply anything but, you have made it sound as if you know what it feels like to live with that kind of depression. But then, that is one of the marks of a true author: spinning a convincing tale.