As its a rough animation, I'm not going to be hard on this. Plus, you already mentioned the one gripe I had with this, which was how the run cycle didn't sync up with the flying malcrux's reaction.
ON THAT NOTE, I love the application of squash and stretch on the little bugger. You can almost feel the same shock when this is applied correctly.
The only thing I feel I could add at this stage of development is some advice on the wall. The way you added the brick details is good, but if you wanna make them pop, try making them full bricks of a slightly different shade. For example, if the wall is a cold, dull blue; make the bricks a similar shade of purple. I always feel that this method works best in animation, but admittedly, it takes away from a sense of realism you may try to convey. Although, I don't think your going for realism here.
Anyway, to sum up, at the stage this animation is at you're going in the right direction. I wish you all the luck in the world, I can't wait to see the finished product of this ambitious project.