Timer/audio/gameover

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

public class timer : MonoBehaviour
{
    public int time = 30;
    public Text takeONme;
    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(timeon());
    }

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

        takeONme.text = time.ToString();
        //if time go over
        if (time == 0)
        {
            iventsistem.instance.Ontime();
        }
    }

    //routin
    public IEnumerator timeon()
    {
        //while time is longer zero
        while(time > 0)
        {
            yield return new WaitForSeconds(1);
            time -= 1;
        }
    }
}

//

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

public class audio : MonoBehaviour
{
    public GameObject proop;
    public GameObject ulose;

    //signature to event
    void Start()
    {
        proop.SetActive(false);
    ulose.SetActive(false);

        iventsistem.instance.time += uloose;
        iventsistem.instance.Win += uloose;
        iventsistem.instance.Lose += uloose;

        iventsistem.instance.Sound += prooop;
    }

    //sound ON
    public void prooop()
    {
        proop.SetActive(true);
        StartCoroutine(sound());
    }

    //sound ON
    public void uloose()
    {
        ulose.SetActive(true);
    }

    //routin
    IEnumerator sound()
    {
        yield return new WaitForSeconds(0.2f);
        proop.SetActive(false);
    }
}

///

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class GameOver : MonoBehaviour
{
    public Text losee;

    //signature to event
    void Start()
    {
        iventsistem.instance.Win += win;
        iventsistem.instance.Lose += lose;

    }

    //text output
    public void lose()
    {
        losee.text = "you lose";

    }

    //text output
    public void win()
    {
        losee.text = "you win";
    }

}