I didn't know what to think of, but it came off as great! I do like ninjas and I like zombies. It's great that you combined the two! I really liked the music. I love how it's a more straightforward zombie game. Then again, you usually have guns.
Ninjas have no use for that. It really is fast paced. I love that in a game. It could probably have more a background, but still great. Zombies are good for any time of the year!