Игрок плавно падает вместо двойного прыжка в 2д

using UnityEngine;
 
public class MovePlatformer : MonoBehaviour
{
public float Speed;
public Rigidbody2D rb;
public float JumpForce;
private int ExtraJump;
public int ExtraJumpValue;
 
public Transform GroundCheck;
bool isGrounded = false;
public float groundDistance;
public LayerMask IsGround;
 
public Animator animator;
public float MoveHorizontal;
 
void Start()
{
    ExtraJump = ExtraJumpValue;
}
void FixedUpdate()
{
    float MoveHorizontal = Input.GetAxis("Horizontal");
    Vector2 moving = new Vector2(MoveHorizontal * Speed, rb.linearVelocityY);
    rb.linearVelocity = moving;
 
    if(MoveHorizontal > 0)
    {
        transform.localScale = new Vector2(1,1);
        
    }
    if(MoveHorizontal < 0)
    {
        transform.localScale = new Vector2(-1,1);
        
    }
}
 
void Update()
{
    isGrounded = Physics2D.OverlapCircle(GroundCheck.position, groundDistance, IsGround);
 
    if(Input.GetKeyDown(KeyCode.Space) && isGrounded)
    {
        rb.AddForce(transform.up * JumpForce, ForceMode2D.Impulse);
    }
 
    animator.SetFloat("HorizontalMove", Mathf.Abs(MoveHorizontal));
    MoveHorizontal = Input.GetAxis("Horizontal");
 
    if(Input.GetKeyDown(KeyCode.Space) && ExtraJump > 0)
    {
        rb.AddForce(transform.up * JumpForce, ForceMode2D.Impulse);
        ExtraJump--;
    }
    else if(Input.GetKeyDown(KeyCode.Space) && ExtraJump == 0 && isGrounded == true)
    {
        rb.AddForce(transform.up * JumpForce, ForceMode2D.Impulse);
    }
 
 
    if(isGrounded == true)
    {
        ExtraJump = ExtraJumpValue;
    }
}
    
}

    if (Input.GetKeyDown(KeyCode.Space) && ExtraJump > 0)
    {
        var vel = rb.velocity;
        vel.y = JumpForceY;
        rb.velocity = vel;
        ExtraJump--;
    }

    if (Input.GetKeyDown(KeyCode.Space) && ExtraJump > 0)
    {
        var vel = rb.velocity;
        vel.y = 0.0f;
        rb.velocity = vel;
 
        rb.AddForce(transform.up * JumpForce, ForceMode2D.Impulse);
        ExtraJump--;
    }