I loved this movie. I'm so happy that I live in a time when it's possible to experience stories this way.
For me, it's about the idea that we're always trying to make things perfect, and the fact that they never will be.
Max’s perfect snowcave that he builds is destroyed. The world that Carol and Max dream of – the fort where everybody is happy and your enemy’s brain explodes when they go inside – doesn't work out so well. Max's dream of being a king with a double re-cracker that busts through anything only lasts so long.
They are all Ideal Worlds and the story seems to say, ‘Keep going for those ideals, keep dreaming, keep trying, because interesting things happen along the way, but nothing will ever be perfect and, if it is, it will only be for a moment.’ I guess this is what all good stories speak of. This is, perhaps, the basic truth underscoring life. ‘Participate joyfully in the sorrows of the world’ and all that stuff.
This sheds light on my current story, too. Better go write it.