The maze symbolizes; the boys trial, their problem solving abilities, and how well they can work together. Their goal is to escape the glade and to do that they have to solve the maze but to solve the maze they have to work together.
W.I.C.K.E.D symbolizes what happened to the outside world. It summarizes it up in itself as an acronym for "World In Catastrophe Killzone Experiment Department" the outside world was left in disaster and now this company is raising children to help save the world by testing them.