Jumping on walls (platformer movement)

QuickPlayer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class QuickPlayer : MonoBehaviour
{

    Rigidbody2D rb;
    float xInput;
    bool isGrounded;
    bool isOnTheWall;
    bool wallIsOnRight;
    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update()
    {
        if (isGrounded)
        {
            //movement
            xInput = Input.GetAxis("Horizontal") * 5;
            rb.velocity = new Vector2(xInput, rb.velocity.y);
        
            //jump
            if( Input.GetKeyDown(KeyCode.Space)){
                rb.AddForce(Vector2.up * 1000f);
                isGrounded = false;
            }
        }

        if (isOnTheWall)
        {

            if (Input.GetKeyDown(KeyCode.Space))
            {
                rb.constraints = RigidbodyConstraints2D.None;
                rb.constraints = RigidbodyConstraints2D.FreezeRotation;
                if (wallIsOnRight)
                {
                    rb.AddForce(new Vector2(0.5f, 0.5f) * 1000f);
                }
                else
                {
                    rb.AddForce(new Vector2(-0.5f, 0.5f) * 1000f);
                }
               
                isOnTheWall = false;
            }
        }
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {

        if (collision.transform.tag == "Wall")
        {

            if(transform.position.x > collision.transform.position.x)
            {
                wallIsOnRight = true;
            } else
            {
                wallIsOnRight = false;
            }
           
            isOnTheWall = true;
            rb.constraints = RigidbodyConstraints2D.FreezeAll;
            GetComponent<SpriteRenderer>().color = Color.green;
        }
        
    }


    private void OnCollisionStay2D(Collision2D collision)
    {
        if (collision.transform.tag != "Wall")
        {
            isGrounded = true;
            GetComponent<SpriteRenderer>().color = Color.red;
        }
    }


    private void OnCollisionExit2D(Collision2D collision)
    {
        isGrounded = false;
        GetComponent<SpriteRenderer>().color = Color.white;
    }




}