BouncerLeft.cs

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

public class BouncerLeft : MonoBehaviour
{
    public float horizontalBounce = -15.0f;
    public float upBounce = 10.0f;
    GameObject player;

    // Start is called before the first frame update
    void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player");
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        player.GetComponent<Rigidbody2D>().velocity = -player.GetComponent<Rigidbody2D>().velocity;
        player.GetComponent<Rigidbody2D>().AddForce(new Vector2(horizontalBounce, upBounce), ForceMode2D.Impulse);
    }
}