In a way, the main actress's struggles, and everything she did can really represent many different groups of people at different times over the course of her life, and also represents how much purpose to your life chasing something can give. Like, it doesn't matter if you ever catch up to it, and "achieving actual happiness" isn't going to happen just by reaching that goal, what's actually going to make you happy is the mere act of chasing that happiness. It was like the person that chiyoko was following was almost like a metaphor for that.
And the incorperation of all the films she was in to her journey, and how they so effortlessly worked in that actress who opposed her in all her roles to opposing her in real life, and even the filmmaker who was making the documentary about her, who played the role of the person who saved her in all of her films in the course of her telling the story, and then he turned out to be the actual person who saved her life back then on set... Genius.
The painting on the moon she saw, and then paralleled the beginning of the movie with the end with her launching off into space, that really made me cry right there, that's just so beautiful, man. I just don't know if I can really explain why.