Why doesn't the square want to move?

Question

Unity

Here is the code, there are no errors. The script weighs on lighting in obj the cube is inserted. 2d game

public GameObject obj;
  private GameObject inst_obj;
  [SerializeField]
  private float speed = 4f;
    // Start is called before the first frame update
    void Start()
    {
        inst_obj = Instantiate(obj, new Vector3 (0, 0, 0), Quaternion.identity) as GameObject;
    }

    // Update is called once per frame
    void Update()
    {
      float zPos = Input.GetAxis("Vertical");

      inst_obj.transform.Translate(Vector3.forward * speed * zPos * Time.deltaTime);
    }

Answer 1

Well, and Vector3.forward is the same in z, change it to up, left, right, down. These are y, x respectively.
And it turns out that he changes z, but does not move