Enemy1.cs

using UnityEngine;
using System.Collections;

public class Enemy1 : MonoBehaviour {

    public int health = 1;

    public Vector3 enemyAngle = new Vector3(0, 90, 270);
    public float test;

    //shooting -----------------------
    public GameObject turret;
    public GameObject bullet;
    public Vector3 posCanon;
    public GameObject newBullet;


    void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.tag == "Bullet")
        {
            Destroy(gameObject);

        }
    }

    void Update()
    {
        test = gameObject.transform.position.y;
        //shooting---------------------------------------------------------------------------------
        posCanon = new Vector3(turret.transform.position.x, turret.transform.position.y - 0.5f, turret.transform.position.z);
        if (test % 2 == 0)
        {
            newBullet = (GameObject)Instantiate(bullet, posCanon, transform.rotation);
            iTween.MoveTo(posCanon, new Vector3(posCanon.transform.position.x, posCanon.transform.position.y - 20, 5), 1);

        }


        if (health == 0)
            Destroy(gameObject);

        if (transform.eulerAngles != enemyAngle)
            transform.eulerAngles = enemyAngle;
    }

}