pretty good
some things that need to be improved upon though:
1) as others have said, grandpas voice sounded too young.
2) there was a huge lack of emotion on the boys' faces. While they were running for their lives, they all had the same stupid smile they had since the beginning.
3)also the scarecrow was clearly not made out of the demon farmer's flesh, it looked as if it was made of straw.
4)I think the idea that the grandpa was the boy that survived when he ran away could've been presented better.
Thats all i can think of, other then that great job.