A Gen X Big Chill would be a stocktaking of a generation that defined itself as a lost generation reared in the Boomers' shadows, armored against the looming corpo-climate apocalypse with the sword of irony and the shield of sincerity.
Which is basically what Grossman is doing here. What's more, doing this as a superhero story is a genius move - what could be a better metaphor for a teen's unrealistic certainty of destined greatness than a superhero?