What is the author's style in Wit by Margaret Edson?

Wit is a play and each character speaks lines from a script in the first person. In this particular play, Vivian – the central character - acts as the narrator and guide through the tale, outside of the scenes where she interacts with other characters. With this device, the audience is privy to Vivian’s thoughts and emotions that would not be apparent if she were limited to speaking with the other characters.