No errors, but what I've got doesn't work and I cannot figure out why. All I'm looking for is the variable called health to go down by 1 point with every movement in the inspector. The script is attached to a player prefab. N.B. Even if I change the value of the variable in the script it remains the same in the inspector. Here's the code. Some help would be much appreciated.

pragma strict

var hit : RaycastHit;

var utran;

var newTile : GameObject;

public var health : int;

function Start () {

 health = 300;

}

function Update () {

 utran = new Vector3 (transform.position.x, transform.position.y, transform.position.z-0.5);
 
 if (Input.GetKeyUp(KeyCode.A))
 {
     if (Physics.Raycast (transform.position, -Vector3.right, hit, 25))
     {
         if (hit.transform.tag == "Floor" || hit.transform.tag == "Exit" || hit.transform.tag == "Tassel")
         {
             transform.position.x -= 2.75;
             health -= 1;
         }
     }
 }
 
 if (Input.GetKeyUp(KeyCode.D))
 {
     if (Physics.Raycast (transform.position, Vector3.right, hit, 25))
     {
         if (hit.transform.tag == "Floor" || hit.transform.tag == "Exit" || hit.transform.tag == "Tassel")
         {
             transform.position.x += 2.75;
             health -= 1;
         }
     }
 }
 
 if (Input.GetKeyUp(KeyCode.W))
 {
     if (Physics.Raycast (transform.position, Vector3.up, hit, 25))
     {
         if (hit.transform.tag == "Floor" || hit.transform.tag == "Exit" || hit.transform.tag == "Tassel")
         {
             transform.position.y += 2.75;
             health -= 1;
         }
     }
 }
 
 if (Input.GetKeyUp(KeyCode.S))
 {
     if (Physics.Raycast (transform.position, -Vector3.up, hit, 25))
     {
         if (hit.transform.tag == "Floor" || hit.transform.tag == "Exit" || hit.transform.tag == "Tassel")
         {
             transform.position.y -= 2.75;
             health -= 1;
         }
     }
 }
 
 
 if (Physics.Raycast (utran, Vector3.forward, hit, 5))
 {
     if (hit.transform.tag == "Exit")
     {
         Application.LoadLevel(Application.loadedLevel);
     }
 }
 
 if (Physics.Raycast (utran, Vector3.forward, hit, 5))
 {
     if (hit.transform.tag == "Tassel")
     {
         Destroy (hit.transform.gameObject);
         Instantiate (newTile, hit.transform.position, hit.transform.rotation);
     }
 }
 

}