проблема с прыжками в андроид игре

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
 
public class TrafficHeroes : MonoBehaviour {
    
    public float horizontalSpeed;
    float speedX;
    public float verticalImpulse;
    Rigidbody2D rb;
    bool isGrounded;
    [SerializeField] private int Jump;
    [SerializeField] private int jumpCount;
    [SerializeField] private int jumpCountMax;
 
    void Start () 
    {
        rb = GetComponent<Rigidbody2D> ();
    }
 
    public void OnClickJump()
    {
        if (jumpCount < jumpCountMax)
            rb.AddForce (new Vector2 (0, verticalImpulse), ForceMode2D.Impulse);
        jumpCount++;
    }
 
    void FixedUpdate () {
        transform.Translate (speedX, 0, 0);
    }
 
    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag == "Ground")
            isGrounded = true;
    }
 
    private void OnCollisionExit2D(Collision2D collision)
    {
        if (collision.gameObject.tag == "Ground")
            isGrounded = false;
        jumpCount = 0;
    }
 
 
    void OnTriggerEnter2D(Collider2D other)
    { 
        if (other.tag == "Respawn") 
        {
            SceneManager.LoadScene(2);
        }
    }
}