Very good, although there were a few issues which really detracted from your great story and animation.
The voice acting was good, but the distortion you placed on the Winds and on the Nattodesu made it impossible to hear what they were saying, especially on the Nattodesu. I missed loads of what was happening because I couldn't understand the demon.
Also, the explosion at the end was…bad. Sorry to be blunt, but the way you had just laid the effect over the still looked terrible - next time, try to actually integrate the stock footage with a brickbuilt explosion of debris, or digitally throw bricks everywhere. You should also try not to show the bottom of the explosion, as you can see that's the border of the footage and in your shot it was just hanging in mid-air. Considering how good the rest of your effects were, you could've done better. What VFX software do you use? It'd be easier to give you some pointers if I knew.
That said, overall it was a pretty good, solid brickfilm! I take it this is a series?
"Nothing goes down 'less I'm involved. No nuggets. No onion rings. No nothin'. A cheeseburger gets sold in the park, I want in! You got fat while we starved on the streets...now it's my turn!" -Harley Morenstein