ufo/Assets/Script/EnemyControl.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemyControl : MonoBehaviour
{

    public Vector2 startWait;
    public Vector2 maneuverTime;
    public Vector2 maneuverWait;
    public float dodge;
   
    public float speed;

    private float targetmaneuver;
    

    // Use this for initialization
    void Start()
    {
        StartCoroutine(RandomDir());
    }

    // Update is called once per frame
    void Update()
    {

    }

    void FixedUpdate()
    {
        float newMan = Mathf.MoveTowardsAngle(transform.eulerAngles.z, targetmaneuver, Time.deltaTime * 10);

        transform.rotation = Quaternion.Euler(0, 0, newMan);
        transform.Translate(Vector3.up * Time.deltaTime * speed);
    }

    IEnumerator RandomDir()
    {
        yield return new WaitForSeconds(Random.Range(startWait.x, startWait.y));
        while (true)
        {
            targetmaneuver = Random.Range(1, dodge) * -Mathf.Sign(transform.eulerAngles.z);
            yield return new WaitForSeconds(Random.Range(maneuverTime.x, maneuverTime.y));
            targetmaneuver = 0;
            yield return new WaitForSeconds(Random.Range(maneuverWait.x, maneuverWait.y));
        }
    }
}