What is the author's style in The Birthday Party by Harold Pinter?

Justified or not, The Birthday Party has been read as a kind of modern allegory. That interpretation is partly based on the fact that there is little to anchor the play's setting in a world beyond its limits. Pinter's deliberate vagueness and use of fragmented information tend to confirm that he has a symbolic purpose. Some elements seem particularly conducive to interpretation. Among other things, the toy drum, the birthday party itself, McCann's seemingly gratuitous act of breaking Stanley's glasses, and the outfitting of Stanley in respectable clothes before he is led off.