void Update () {

transform.position = new Vector2 (Mathf.Clamp(transform.position.x, -6.6f, 6.6f), Mathf.Clamp(transform.position.y, -4.9f, 4.9f));

  if (Input.GetKey ("up"))
   transform.Translate (Vector2.up * Time.deltaTime);
  if (Input.GetKey ("down"))
   transform.Translate(Vector2.down * Time.deltaTime);
  if (Input.GetKey ("right"))
   transform.Translate(Vector2.right * Time.deltaTime);
  if (Input.GetKey ("left"))
   transform.Translate(Vector2.left * Time.deltaTime);  
    }
}

float yMove = Input.GetAxis("Vertical") * Time.deltaTime;
     transform.Translate(0f, yMove, 0f);
      Vector3 clampedPosition = transform.position;
      clampedPosition.y = Mathf.Clamp(transform.position.y, -4.1f, 4.1f);
      transform.position = clampedPosition;

void Update () {

    var move = Vector2.zero;

    if (Input.GetKey ("up")) move += Vector2.up;
    if (Input.GetKey ("down")) move += Vector2.down;
    if (Input.GetKey ("right")) move += Vector2.right;
    if (Input.GetKey ("left")) move += Vector2.left;
    
    var position = transform.position + move * Time.deltaTime;
    
    position.x = Mathf.Clamp(position.x, -6.6f, 6.6f);
    position.y = Mathf.Clamp(position.y, -4.9f, 4.9f);
  
    transform.position = position;
}

   public GameObject Lamp;

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.name == "Character1")
        {
            Lamp.SetActive(true);
        }
    }
    private void OnTriggerExit2D(Collider2D collision)
    {
        if (collision.gameObject.name == "Character1")
        {
            Lamp.SetActive(false);
        }
    }