WOW! LOVED IT!
The graphics were very good, I'm a sucker for stick figure games/movies. I liked the idea that they were buried with weapons, even though it's a little unrealistic, it's still pretty cool. The sound was awesome, and that dramatic music stab was per-fect! I usually don't care if there's violence or not, but there was, and I loved it. I did have a few problems with the movie though: 1. I don't know if they're zombies or not. 2. It was too short, make the next movie longer.
Also I have an idea for you. To clear some answers up, here's what I'd do. You should make a prequel to part one, that shows who they are, why they're dead, and how they died, but it's just an idea!