"CI QuickSave" package-based saving in C# Unity, using IPersistable interface

SaveManager.cs

using System;
using System.Linq;
using UnityEngine;
using CI.QuickSave.Core.Storage;

/**
 * Central place for triggering game saving & loading.
 * Classes using [QuickSave] package will end up writing files at [Application.persistentDataPath]:
 *   MacOS: ~/Library/Application\ Support/DefaultCompany/<productname>/QuickSave
 *   Windows: %userprofile%\AppData\LocalLow\<companyname>\<productname>
 **/
public class SaveManager
{
    // Prevent creating multiple instances
    private SaveManager() { }

    public static void SaveGame()
    {
        Debug.Log("Triggering Game Save");
        
        // 1. Save state for Unity objects
        var unityPersistables = GameObject.FindObjectsOfType<MonoBehaviour>().OfType<IPersistable>();
        foreach (IPersistable persistable in unityPersistables)
        {
            persistable.Save();
        }
        
        // 2. Save state for other known (non-Unity) persistables
        ((IPersistable)QuestManager.Instance).Save();
        ((IPersistable)Inventory.Instance).Save();
        // ...
    }

    public static void LoadGame()
    {
        Debug.Log("Triggering Game Load");

        // 1. Load state for other known (non-Unity) persistables
        ((IPersistable)Inventory.Instance).Load();
        ((IPersistable)QuestManager.Instance).Load();
        // ...

        // 2. Load state for Unity objects
        var unityPersistables = GameObject.FindObjectsOfType<MonoBehaviour>().OfType<IPersistable>();
        foreach (IPersistable persistable in unityPersistables)
        {
            try
            {
                persistable.Load();
            }
            catch (Exception e)
            {
                Debug.LogError("Loading of Game failed with: " + e.Message);
            }
        }
    }

    public static void DeleteGame()
    {
        foreach (string fileName in FileAccess.Files(includeExtensions: true))
        {
            FileAccess.Delete(fileName, includesExtension: true);
        }
    }

    public static bool HasSavedGame()
    {
        return FileAccess.Files(includeExtensions: true)
                .GetEnumerator()
                .MoveNext();
    }

}