Metamorphosis is an existential, absurd, beautiful work about alienation. The setting is claustrophobic which reflects the claustrophobic relationships and attitudes around Gregor Samsa. His (petite) bourgeois family depends on him for income. This book is very fun to analyse from many vantage points and provides reflections on modern society. It's possible that him turning into a bug is metaphor for underlying alienation. An economic analysis would suggest that part of the alienation resulted from being cut off from one's work which is characteristics of capitalism. In the epilogue, the alienation extends to the family following Gregor's death. The comments on Grete Samsa may suggest that the same fate will befall her.