Autocannon 2d and how to figure it out?

Question

Unity

Hello. I was looking for a video on autocannon in 2d and as a result there are practically no video tutorials or they are in 3d. Of course, it didn’t bother me to remake them for my project, but there is one nuance that I still can’t decide.

public class AI : MonoBehaviour {
[Header ("Характеристики")]
public Transform target;

public Transform Tower;
public float speedTurn = 5f;
public float range = 10f;

public string enemyTag = "Enemy";

private void Start()
{

    InvokeRepeating("UpdateTarget", 0f, 0.5f);
}

void Update()
{

    if (target == null)
        return;

    Vector3 direction = target.position - transform.position;
    Quaternion lookRotation = Quaternion.LookRotation(direction);
    Vector3 rotation = Quaternion.Lerp(Tower.rotation, lookRotation, Time.deltaTime * speedTurn).eulerAngles;
    Tower.rotation = Quaternion.Euler(0f, 0f, rotation.z); 



}

void UpdateTarget()
{

        GameObject[] enemies = GameObject.FindGameObjectsWithTag(enemyTag);        
        float shortesDistance = Mathf.Infinity;
        GameObject nearesEnemy = null;
        foreach (GameObject enemy in enemies)
        {
            float distanceToEnemy = Vector3.Distance(transform.position, enemy.transform.position);
            if (distanceToEnemy < shortesDistance)
            {
                shortesDistance = distanceToEnemy;
                nearesEnemy = enemy;
            }
        }

        if (nearesEnemy != null && shortesDistance <= range)
        {
            target = nearesEnemy.transform;
        }
        else
        {
            target = null;
        }
    }

private void OnDrawGizmosSelected()
{
    Gizmos.color = Color.blue;
    Gizmos.DrawWireSphere(transform.position, range);
}


}

The problem itself is that the "gun" finds the "enemy" at close range, namely, it begins to turn towards him.