Health won't work.

Hi. I'm making a game which requires me to have a healthscript and a seperate damage script. I tried following a tutorial from unity. But it won't work. I am still new at this, although I know a little bit. So can anyone please help me? Just try to tell me what's wrong because I've no clue. I would be so grateful.

Here's my Health Script

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class HealthScript : MonoBehaviour {
 
     public int startingHealth = 3;                           
     public int currentHealth;                                   
     public Slider healthSlider;                                 
     
     
     void Awake ()
     {
 
     
         currentHealth = startingHealth;
     }
     
     
     void Update ()
     {
 
     
     }
     
     
     public void TakeDamage (int amount)
     {
         
         // Reduce the current health by the damage amount. cuz that has to happen
         currentHealth -= amount;
         
         // Set the health bar's value to the current health. cuz that's cool (amirite?)
         healthSlider.value = currentHealth;
         
 
         if(currentHealth <= 0)
         {
             // ... it should die. so please die
             Destroy (gameObject);
             Debug.Log ("Yesh this works.");
         }
     }
     
     
 
 }
 

And this is my Move/Damage script. Yes it's a bit messy. sorry

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class moveP1 : MonoBehaviour {
     //Move and wall stuff
     public KeyCode upKey;
     public KeyCode downKey;
     public KeyCode rightKey;
     public KeyCode leftKey;
 
     public float speed;
 
     public GameObject wallPrefab;
     public GameObject BulletPrefab;
 
     Collider2D wall;
     Collider2D Bullet;
 
     Vector2 lastWallEnd;
 
     public float orthographicSize;
 
     //health stuff
     HealthScript playerHealth; 
     GameObject player;
 
     public int attackDamage;
     public GameObject other;
 
     bool isHit = false;
     bool bulletHit = false;
 
 
     void Start () 
     {
         player = GameObject.FindGameObjectWithTag ("player");
         playerHealth = player.GetComponent <HealthScript> ();
 
         Camera.main.orthographicSize = 80;
         GetComponent<Rigidbody2D>().velocity = Vector2.up * speed;
         spawnWall();
         InvokeRepeating ("BulletSpawner", 1f, 3f-(Time.deltaTime));
 
         // health stuff
 
 
     }
     
 
     void Update () 
     {
 
 //move
         if (Input.GetKeyDown (upKey)) {
             GetComponent<Rigidbody2D> ().velocity = Vector2.up * speed;
             spawnWall ();
         } else if (Input.GetKeyDown (downKey)) {
             GetComponent<Rigidbody2D> ().velocity = -Vector2.up * speed;
             spawnWall ();
         } else if (Input.GetKeyDown (rightKey)) {
             GetComponent<Rigidbody2D> ().velocity = Vector2.right * speed;
             spawnWall ();
         } else if (Input.GetKeyDown (leftKey)) {
             GetComponent<Rigidbody2D> ().velocity = -Vector2.right * speed;
             spawnWall ();
         }
     
         fitColliderBetween (wall, lastWallEnd, transform.position);
         //Health?
         if (isHit) 
         {
             playerHealth.TakeDamage (3);
             isHit = false;
         }
 
         if(bulletHit)
         {
             playerHealth.TakeDamage (1);
             Destroy (other );
             bulletHit = false;
         }
         //Loading levels
         if (GameObject.Find("player 1") ) 
         {
             //Debug.Log ("Don't die!");
         } 
         else 
         {
             Application.LoadLevel("player 2 won");
         }
         
         
         if (GameObject.Find("player 2") ) 
         {
             //Debug.Log ("Don't die!");
         } 
         else 
         {
             Application.LoadLevel("player 1 won");
         }
     }
 
     void BulletSpawner() 
     {
         GameObject rr = (GameObject)Instantiate (BulletPrefab, new Vector3(5, 0, 0), Quaternion.Euler(0,0,Random.Range(0,360)));
         Bullet = rr.GetComponent<Collider2D> ();
     }
 
     void spawnWall()
     {
         lastWallEnd = transform.position;
 
         GameObject g = (GameObject)Instantiate(wallPrefab, transform.position, Quaternion.identity);
         wall = g.GetComponent<Collider2D>();
     }
 
     void fitColliderBetween(Collider2D co, Vector2 a, Vector2 b) 
     {
         co.transform.position = a + (b - a) * 0.5f;
           
         float dist = Vector2.Distance(a, b);
         if (a.x != b.x)
             co.transform.localScale = new Vector2(dist + 1, 1);
         else
             co.transform.localScale = new Vector2(1, dist + 1);
     }
     
 
     void OnTriggerEnter2D(Collider2D co) 
     {
         
         if (co != wall) 
         {
             isHit = true;
         }
         
         if (co = Bullet) 
         {
             bulletHit = true;
 
         }  
 
 
     }
 
 
 
 }