Problems with rigidbody2D.AddForce

Hi! , Im trying to get jumps like the game "the impossible game": https://www.youtube.com/watch?v=vW8nXTzroos

Well, I wrote the essential, some rigidbody2D.AddForce to make the jump etc, the PROBLEM is that when I click ( It add the force in Y) it add more force to X, and obviously I don't want that, I want to keep the velocity in the X.

And sorry for my english ^^ Ohh and if someone knows how to do these types of jumps like the video I posted, tell me please! I tried to change the gravity but I still without get this type of jumps hehe.

Here is the code, hope you can help me guys!:

 using UnityEngine;
 using System.Collections;
 
 public class controladorPersonaje : MonoBehaviour {
 
     public float fuerzaSalto = 100f;
     public float fuerzaCorrer = 100f;
 
     public bool enSuelo = true;
     public bool enSuelo1 = true;
     public bool enSuelo2 = true;
     public bool enSuelo3 = true;
     public bool enSuelo4 = true;
 
 
     
 
     public Transform comprobadorSuelo;
     float comprobadorRadio = 0.07f;
     public Transform comprobadorSuelo1;
     float comprobadorRadio1 = 0.07f;
     public Transform comprobadorSuelo2;
     float comprobadorRadio2 = 0.07f;
     public Transform comprobadorSuelo3;
     float comprobadorRadio3= 0.07f;
     public Transform comprobadorSuelo4;
     float comprobadorRadio4 = 0.07f;
     public LayerMask mascaraSuelo;
     private Animator animator;
 
     void Awake(){
         animator = GetComponent<Animator> ();
         }
 
     // Use this for initialization
     void Start () {
 
     }
 
     void FixedUpdate(){
 
 
                 enSuelo = Physics2D.OverlapCircle (comprobadorSuelo.position, comprobadorRadio, mascaraSuelo);
                 animator.SetBool ("isGrounded", enSuelo);
 
         enSuelo1 = Physics2D.OverlapCircle (comprobadorSuelo1.position, comprobadorRadio1, mascaraSuelo);
         animator.SetBool ("isGrounded", enSuelo1);
         
         
         enSuelo2 = Physics2D.OverlapCircle (comprobadorSuelo2.position, comprobadorRadio2, mascaraSuelo);
         animator.SetBool ("isGrounded", enSuelo2);
         
         enSuelo3 = Physics2D.OverlapCircle (comprobadorSuelo3.position, comprobadorRadio3, mascaraSuelo);
         animator.SetBool ("isGrounded", enSuelo3);
         
         enSuelo4 = Physics2D.OverlapCircle (comprobadorSuelo4.position, comprobadorRadio4, mascaraSuelo);
         animator.SetBool ("isGrounded", enSuelo4);
 
         rigidbody2D.AddForce (new Vector2 (fuerzaCorrer, 0));
 
         if (enSuelo && Input.GetMouseButton (0) || enSuelo1 && Input.GetMouseButton (0)|| enSuelo2 && Input.GetMouseButton (0)|| enSuelo3 && Input.GetMouseButton (0)|| enSuelo4  && Input.GetMouseButton (0)) {
 
 
             rigidbody2D.AddForce (new Vector2 (0, fuerzaSalto));
             //transform.Rotate(new Vector3(0,0,70));
             //transform.Rotate(0, Time.deltaTime * 30, 0, Space.Self);
 
 
                 }
 
         }
     // Update is called once per frame
 
 
 
     void Update () 
     {
 
     }
         
 
 }