What is the author's style in Death, the High Cost of Living by Neil Gaiman?

As the entire story is dialogue, whether it be between the characters or internal in the case of Sexton, the author allows the reader to experience the events as if they are a part of the novel. The reader gains insight into Sexton's thoughts when he discusses his reasons for contemplating suicide at the beginning of the novel, as Sexton seems to spend most of his time on his own. His only communication seems to be with Billy, the boy who cannot speak, which makes Sexton comfortable sharing his thoughts. As the novel progresses, Sexton comes out of his shell and begins to express himself to Didi and others, taking part in life around him rather than watching it and waiting for something better to come along.