super mario bros

using UnityEngine;  public class PlayerController : MonoBehaviour {     public float moveSpeed = 5f;     public float jumpForce = 5f;     private bool isJumping = false;      private Rigidbody2D rb;     private Animator animator;      private void Start()     {         rb = GetComponent<rigidbody2d>();         animator = GetComponent<animator>();     }      private void Update()     {         float moveX = Input.GetAxis("Horizontal");          rb.velocity = new Vector2(moveX * moveSpeed, rb.velocity.y);          animator.SetFloat("Speed", Mathf.Abs(moveX));          if (Input.GetButtonDown("Jump") && !isJumping)         {             rb.AddForce(new Vector2(0f, jumpForce), ForceMode2D.Impulse);             isJumping = true;         }     }      private void OnCollisionEnter2D(Collision2D collision)     {         if (collision.gameObject.CompareTag("Ground"))         {             isJumping = false;         }     } } </animator></rigidbody2d>