Boring and Slow
Your character moves way to slow and it get repetitive and boring WAY to fast.
considering your supposed to be a ninja, it's odd seeing as how he is slower than a turtle.
maybe make the zombies come in waves, and before each wave allowing you to heal and obtain new items or weapons, the teleport slice is very flawed and is not every usefull. but it's somewhat decent and enjoyable for a few minutes.
Not Bad but you should try something harder !