Как сделать отпрыгивание от стен в 2d?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class PlayerController : MonoBehaviour
{
    public float speed;
    public float normalSpeed;
    public float jumpForse;
    private float moveInput;
    private Rigidbody2D rb;
    private bool isGrounded;
    public Transform feetPos;
    public float checkRadius;
    public LayerMask whatIsGround;
    private void Start()
    {
        speed = 0f;
        rb = GetComponent<Rigidbody2D>();
    }
 
    private void FixedUpdate()
    {
        rb.velocity = new Vector2(speed, rb.velocity.y);
 
    }
 
    private void Update()
    {
        isGrounded = Physics2D.OverlapCircle(feetPos.position, checkRadius, whatIsGround);
    }
    public void OnJumpButtonDown()
    {
        if (isGrounded == true)
        {
            rb.velocity = Vector2.up * jumpForse ;
        }
    }
    public void OnLeftButtonDown()
    {
        if (speed >= 0f)
        {
            speed = -normalSpeed;
            transform.eulerAngles = new Vector3(0, 180, 0);
        }
    }
    public void OnRightButtonDown()
    {
        if (speed <= 0f)
        {
            speed = normalSpeed;
            transform.eulerAngles = new Vector3(0, 0, 0);
        }
    }
    public void OnButtonUp()
    {
        speed = 0f;
    }
}