ShantiManti/Assets/game/Scripts/Save/SaveSystem.cs

using UnityEngine;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

public static class SaveSystem
{
    public static void SavePlayer()
    {
        BinaryFormatter formatter = new BinaryFormatter();
        string path = Application.persistentDataPath + "/player.save";
        FileStream stream = new FileStream(path, FileMode.Create);

        PlayerData data = new PlayerData();

        formatter.Serialize(stream, data);
        stream.Close();
    }

    public static PlayerData LoadPlayer()
    {
        string path = Application.persistentDataPath + "/player.save";
        if (File.Exists(path))
        {
            BinaryFormatter formatter = new BinaryFormatter();
            FileStream stream = new FileStream(path, FileMode.Open);

            PlayerData data = formatter.Deserialize(stream) as PlayerData;
            stream.Close();

            return data;
        }
        
        Debug.LogError("SaveFile not found in " + path);
        Debug.Log("Creating new save file...");
        SavePlayer();
        return LoadPlayer();
    }
    
}