PlayerController_2.cs

using UnityEngine;

public class PlayerController_2 : MonoBehaviour
{
    public float speed;
    private float xRange = 20;
    private float zRange = 17;
    
    private float horizontalInput; 
    private float verticalInput;   
    
    public GameObject projectilePrefab; 
    
    
    
    void Update()
    {
        horizontalInput = Input.GetAxis("Horizontal");
       // verticalInput = Input.GetAxis("Vertical");
        verticalInput = Input.GetAxis("Vertical");
       
        transform.Translate(Vector3.forward*verticalInput * speed*Time.deltaTime);

        if (transform.position.z < -2)
        {
            transform.position = new Vector3(transform.position.x, transform.position.y, -2);
        }

        if (transform.position.z > zRange)
        {
            transform.position = new Vector3(transform.position.x, transform.position.y, 17);
        }
        
        transform.Translate(Vector3.right * horizontalInput * speed * Time.deltaTime);
        
        if (transform.position.x < -xRange)
        {
            transform.position = new Vector3(-xRange, transform.position.y, transform.position.z);
        }

        if (transform.position.x > xRange)
        {
            transform.position = new Vector3(xRange, transform.position.y, transform.position.z);
        }

        if (Input.GetKeyDown(KeyCode.Space))
        {
            //Launch a projectile from the player
            Instantiate(projectilePrefab, transform.position, projectilePrefab.transform.rotation);
        }
    }
}