public class PlayerController : MonoBehaviour
{
    public static PlayerController instance;

    private Rigidbody rb;
    public float _speed = 1;
    private float _playerSpeed;

    // Start is called before the first frame update
    void Awake()
    {
        instance = this;

        rb = GetComponent<Rigidbody>();
    }

    private void Update()
    {

    }

    // Update is called once per frame
    void FixedUpdate()
    {
        _playerSpeed = Mathf.Lerp(_playerSpeed, _speed, Time.deltaTime);

        rb.velocity = new Vector3(rb.velocity.x, rb.velocity.y, (_playerSpeed * 100 * Time.fixedDeltaTime));

        if (transform.position.z - Camera.main.transform.position.z >= 15f) //Move camera to follow player
        {
            Camera.main.transform.position = new Vector3(0, Camera.main.transform.position.y, transform.position.z - 15f);
        }
    }
}