Sample Unity3D snake game

Play snake game online
Mouse position is captured to drive the snake. SmoothFollowTarget script is used to follow a captured mouse position, as well as for the tail to follow ancestor cell and a head of the snake.
Check out the Unity3D project files from here: https://dl.dropboxusercontent.com/u/50151183/blog/unity/SnakeSample/SnakeSample.zip 

Code:

using UnityEngine;
using System.Collections;

/// 

/// Smooth follow target
/// Used to follow a mouse position as well as for tyhe tail to follow its ancestor
/// 
[RequireComponent(typeof(CharacterController))]
public class SmoothFollowTarget : MonoBehaviour {

    public Transform target;
    public float distance=3;
    public float speed = 40;
    //public float rotationDamping=0.2f;

    private CharacterController controller;


 // Use this for initialization
 void Awake () {
        controller = GetComponent<CharacterController>()
}
 
 // Update is called once per frame
 void Update () {
        //return;
        // Early out if we don't have a target
        if (!target) return;
        // Always look at the target
        transform.LookAt(target);

        // Set the position of the camera on the x-z plane to:
        // distance meters behind the target
        var newPos = target.position - transform.forward * distance;
        newPos.y =1; 
        var speedVector = newPos - transform.position;
        speedVector.y = 0;
        if (speedVector.magnitude>distance)
            controller.SimpleMove(speedVector.normalized * speed);

 }
}