Unity, не могу написать код

Помогите исправить код чтобы анимация работала и объект прыгал только находясь на земле
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
[SerializeField] private float speed = 3f;
[SerializeField] private int lives = 5;
[SerializeField] private float jumpForce = 15;
private bool isGrounded = false;

private Rigidbody2D rb;
private Animator anim;
private SpriteRenderer sprite;

private void Awake()
{
rb = GetComponent<Rigidbody2D>();
anim = GetComponent<Animator>();
sprite = GetComponentInChildren<SpriteRenderer>();
}


private void Update()
{
if (isGrounded) State = States.idle;

if (Input.GetButton("Horizontal"))
Run();
if (isGrounded && Input.GetButtonDown("jump"))
Jump();
}

private void Run()
{
if (isGrounded) State = States.run ;

Vector3 dir = transform.right * Input.GetAxis("Horizontal");

transform.position = Vector3.MoveTowards(transform.position, transform.position + dir, speed * Time.deltaTime);

sprite.flipX = dir.x < 0.0f;
}

private void Jump()
{
rb.AddForce(transform.up * jumpForce, ForceMode2D.Impulse);
if (isGrounded) State = States.jump;
}

private void OnTriggerEnter(Collider other)
{
if (other.gameObject.tag == "Ground")
{
isGrounded = true;
}
}
private States State
{
get { return (States)anim.GetInteger("state"); }
set { anim.SetInteger("state", (int)value); }
}
}

public enum States
{
idle,
run,
jump
}