Amazing film. The plot was exceptional. It describes a boy's journey in overcoming the struggles of moving on with a death and the nightmarish PTSD he faces in accepting the death of a loved one and the inability to save them or do something more.
From my perspective, Miyazaki's apparent final masterpiece serves as a reflection on the inevitability of everything in this world as having an end. However, this end is up to us as individuals to continue to create something more and new. It's up to us to continue building and shaping the world how we see fit and ensure it continues.