EnemySpawner.cs

using UnityEngine;
using System.Collections;

public class EnemySpawner : MonoBehaviour {

    //Numbers
    public int randomNum = 0;


    //Enemy Spawns
    public GameObject enemy1_left1;
    public int enemy1count = 0;
    public GameObject enemy1_left2;
    public GameObject enemy1_left3;
    public GameObject enemy1_right1;
    public GameObject enemy1_right2;
    public GameObject enemy1_right3;

    //vectors
    public Vector3 spawn1 = new Vector3(-17.0f, 17.0f, 5.0f);
    public Vector3 spawn2 = new Vector3(-14.0f, 17.0f, 5.0f);
    public Vector3 spawn3 = new Vector3(-11.0f, 17.0f, 5.0f);
    public Vector3 spawn4 = new Vector3(-8.0f, 17.0f, 5.0f);
    public Vector3 spawn5 = new Vector3(-5.0f, 17.0f, 5.0f);
    public Vector3 spawn6 = new Vector3(-2.0f, 17.0f, 5.0f);
    public Vector3 spawn7 = new Vector3(1.0f, 17.0f, 5.0f);
    public Vector3 spawn8 = new Vector3(4.0f, 17.0f, 5.0f);
    public Vector3 spawn9 = new Vector3(7.0f, 17.0f, 5.0f);
    public Vector3 spawn10 = new Vector3(10.0f, 17.0f, 5.0f);
    public Vector3 spawn11 = new Vector3(13.0f, 17.0f, 5.0f);
    public Vector3 spawn12 = new Vector3(16.0f, 17.0f, 5.0f);

	public Vector3 enemyAngle = new Vector3 (0.0f, 90.0f, 270.0f);


    //Enemy Types
    public GameObject enemy1;
    public GameObject enemy2;

	// Use this for initialization
	void Start () {
        randomNum = 1;
    }
    public void Onslaught()
    {
     //   randomNum = Random.Range (1,3);
        StartCoroutine(EnemySpawn());
    }
	
	// Update is called once per frame
	void Update () {
        if (randomNum > 0)
            Onslaught();
	}

	public void EdgeSpawn()
	{
		enemy1_left1 = (GameObject)Instantiate(enemy1, spawn1, Quaternion.Euler(enemyAngle));
		enemy1_right1 = (GameObject)Instantiate(enemy1, spawn12, Quaternion.Euler(enemyAngle));
		iTween.MoveTo(enemy1_left1, iTween.Hash("path", iTweenPath.GetPath("LeftCurve1"), "time", 10));
		iTween.MoveTo(enemy1_right1, iTween.Hash("path", iTweenPath.GetPath("RightCurve1"), "time", 10));

	}
	public void EdgeSpawnIn()
	{
		enemy1_left2 = (GameObject)Instantiate(enemy1, spawn2, Quaternion.Euler(enemyAngle));
		enemy1_right2 = (GameObject)Instantiate(enemy1, spawn11, Quaternion.Euler(enemyAngle));
		
		iTween.MoveTo(enemy1_left2, iTween.Hash("path", iTweenPath.GetPath("LeftCurve2"), "time", 10));
		iTween.MoveTo(enemy1_right2, iTween.Hash("path", iTweenPath.GetPath("RightCurve2"), "time", 10));

	}

	public void EdgeSpawnLast()
	{
		enemy1_left3 = (GameObject)Instantiate(enemy1, spawn3, Quaternion.Euler(enemyAngle));
		enemy1_right3 = (GameObject)Instantiate(enemy1, spawn10, Quaternion.Euler(enemyAngle));
		
		iTween.MoveTo(enemy1_left3, iTween.Hash("path", iTweenPath.GetPath("LeftCurve3"), "time", 10));
		iTween.MoveTo(enemy1_right3, iTween.Hash("path", iTweenPath.GetPath("RightCurve3"), "time", 10));

	}

    public void MidSpawnEdges()
    {
        enemy1_left1 = (GameObject)Instantiate(enemy2, spawn4, Quaternion.Euler(enemyAngle));
        enemy1_right1 = (GameObject)Instantiate(enemy2, spawn9, Quaternion.Euler(enemyAngle));

        iTween.MoveTo(enemy1_left1, iTween.Hash("path", iTweenPath.GetPath("CrossPath Mid-Left 1"), "time", 10));
        iTween.MoveTo(enemy1_right1, iTween.Hash("path", iTweenPath.GetPath("CrossPath Mid-Right 1"), "time", 10));
    }
    public void MidSpawnMids()
    {
        enemy1_left1 = (GameObject)Instantiate(enemy2, spawn5, Quaternion.Euler(enemyAngle));
        enemy1_right1 = (GameObject)Instantiate(enemy2, spawn8, Quaternion.Euler(enemyAngle));

        iTween.MoveTo(enemy1_left1, iTween.Hash("path", iTweenPath.GetPath("CrossPath Mid-Left 2"), "time", 10));
        iTween.MoveTo(enemy1_right1, iTween.Hash("path", iTweenPath.GetPath("CrossPath Mid-Right 2"), "time", 10));
    }

    //IEnumerator
    IEnumerator EnemySpawn()
    {
        if (enemy1count < 1)
        {
            if (randomNum == 1)
            {
                Debug.Log("Enumerator Starts");
                enemy1count = 1;
                enemy1_left1 = (GameObject)Instantiate(enemy1, spawn1, Quaternion.Euler(enemyAngle));
                enemy1_right1 = (GameObject)Instantiate(enemy1, spawn12, Quaternion.Euler(enemyAngle));

                iTween.MoveTo(enemy1_left1, iTween.Hash("path", iTweenPath.GetPath("LeftCurve1"), "time", 10));
                iTween.MoveTo(enemy1_right1, iTween.Hash("path", iTweenPath.GetPath("RightCurve1"), "time", 10));

                //              EdgeSpawn();

                yield return new WaitForSeconds(0.2f);
                enemy1_left2 = (GameObject)Instantiate(enemy1, spawn2, Quaternion.Euler(enemyAngle));
                enemy1_right2 = (GameObject)Instantiate(enemy1, spawn11, Quaternion.Euler(enemyAngle));

                iTween.MoveTo(enemy1_left2, iTween.Hash("path", iTweenPath.GetPath("LeftCurve2"), "time", 10));
                iTween.MoveTo(enemy1_right2, iTween.Hash("path", iTweenPath.GetPath("RightCurve2"), "time", 10));
                //              EdgeSpawnIn();

                yield return new WaitForSeconds(0.2f);
                enemy1_left3 = (GameObject)Instantiate(enemy1, spawn3, Quaternion.Euler(enemyAngle));
                enemy1_right3 = (GameObject)Instantiate(enemy1, spawn3, Quaternion.Euler(enemyAngle));

                iTween.MoveTo(enemy1_left3, iTween.Hash("path", iTweenPath.GetPath("LeftCurve3"), "time", 10));
                iTween.MoveTo(enemy1_right3, iTween.Hash("path", iTweenPath.GetPath("RightCurve3"), "time", 10));
                //                EdgeSpawnLast();

                yield return new WaitForSeconds(2f);
                MidSpawnEdges();

                yield return new WaitForSeconds(2f);
                MidSpawnMids();
                yield return new WaitForSeconds(2f);

                EdgeSpawn();
                MidSpawnEdges();
                yield return new WaitForSeconds(2f);



                Debug.Log("enumerator Ends");

            }

        }

        yield return new WaitForSeconds(1f);
    }
}