Can anyone tell me...

...was the entire point of the film simply about the strength of a mother's love and her desire to protect her daughter? Was there some really outlandish theme, pertaining to Japanese mythology or culture that I missed? I didn't think I missed anything, but it seemed almost too simple. I am shocked I'd never seen this, because it's so well received in horror circles, but this one fell flat for me. I love slow burn Japanese horror, but this one was a little too slow, for such a subtle ending.