fgm24/Assets/Scripts/UI/QuitGame.cs

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

#if UNITY_EDITOR
using UnityEditor;
#endif

public class QuitGame : MonoBehaviour
{
    public Image QuitGraphic;

    private float HoldTime = 0.0f;
    
    public void Quit()
    {
        #if UNITY_EDITOR
            UnityEditor.EditorApplication.isPlaying = false;
        #else
            Application.Quit();
        #endif
    }

    private void Update()
    {
        foreach (var controller in Gamepad.all)
        {
            if (controller.squareButton.IsPressed())
            {
                HoldTime += Time.deltaTime;

                QuitGraphic.fillAmount = HoldTime/2f;

                if (HoldTime > 2f)
                    Quit();

                return;
            }
        }

        // Debug.Log("C# even managed to fuck up return statements");

        QuitGraphic.fillAmount = 1f;
        HoldTime = 0.0f;
    }
}