Score System not working in Flappy Bird Clone

Hello,

I'm trying to make a Flappy Bird clone to improve myself.

I cannot make the score system to work, I'm a newbie in making games.

This is my Player script.

 using UnityEngine;
 
 public class Player : MonoBehaviour
 {
     public Vector2 jumpForce = new Vector2(0, 300);
     public int score;
     public GameObject obstacles;
     public GUIText scoreText;
 
     //Score Sytem
     void Start ()
     {
         score = 0;
         UpdateScore ();
     }
 
     void AddScore ()
     {
         score += 1;
         UpdateScore ();
     }
     
     void UpdateScore () //Shows score on screen
     {
         scoreText.text = "Score : " + score;
     }
 
     
 
 
 
 
     
     void Update ()
     {
         // Keyboard
         if (Input.GetKeyUp("space"))
         {
             rigidbody2D.velocity = Vector2.zero;
             rigidbody2D.AddForce(jumpForce);
         }
 
         // Touchscreen
         
             // Look for all fingers
             for (int i = 0; i < Input.touchCount; i++)
             {
                 Touch touch = Input.GetTouch(i);
                 
                 // -- Tap: quick touch & release
                 // ------------------------------------------------
                 if (touch.phase == TouchPhase.Ended && touch.tapCount == 1)
                 {
                 rigidbody2D.velocity = Vector2.zero;
                 rigidbody2D.AddForce(jumpForce);
                 }
             }
 
         
         // Off screen die (NOT USED)
         Vector2 screenPosition = Camera.main.WorldToScreenPoint(transform.position);
         if (screenPosition.y > Screen.height || screenPosition.y < 0)
         {
             Die();
         }
 
             //ADDING POINTS
         if (this.transform.position.x > obstacles.transform.position.x) {
             AddScore ();
             print ("Works!");
         }
         
         
         
     }
     
     // Collision die
     void OnCollisionEnter2D(Collision2D other)
     {
         Die();
     }
     
     void Die() //Back to the menu
     {
         Application.LoadLevel("menu");
     }
 }

The Player object has a fixed X and only moves on the Y axis. Obstacles move from right to left on the X axis. When Player Object's X is greater than Obstacle Object's X nothing happens.

How is that possible? What's wrong with my code?

I've been trying for days to fix this problem. You guys are my last hope.

Thanks in advance!

Ask me for any explanation.