What I like :
- The music is nice, and catchy.
- Apples have PHYSICS, do you see this, Newton ?!
- Nice concept, and damage indicator.
- The fact, that I'm pointing this out, so this review will loke more profesional.
What I would change :
- The AI of zombies.
- The background should move a little, so you have that feeling of movement.
- Better walking animations.