A few comments.
I rarely review popular sumbissions because my review will most likely not be read. But just in case you read this. I just want you to know that you should not give up on the simple types of drawings that you used in this movie. It really adds to the humour. Also something to keep up is the sequence that things happen. You do a good job of that. The way the guy walks out of his house just as the sword hits his mailbox and different camera angles etc.