Seems like being raised in, and rejecting, a pietist environment can result in some fantastic literature and philosophy. Hesse was raised in a pietist household and smoked cigarettes to protest. Kant was brought up the same and wrote "Critique of Pure Reason".

I don't necessarily regard Hesse's work as necessarily being directed towards a 'coming of age' readership; but, I discovered him at a time when I was struggling with my own "private battles of adolescence" and am grateful in finding his work.