What is the author's style in The River by Gary Paulsen?

The novel is written in the third person point of view. The main character, Brian Robeson, is the main focus of the narration. However, due to some comments made throughout the book, the reader becomes aware that there is also something of an authorial voice, suggesting that the point of view is not just third person omniscient, but more of a third person with the authorial voice.