A save manager for your Unity game. Tutorial: https://www.youtube.com/watch?v=Lt-AiGbHN9g

SaveManager.cs

public class SaveManager : MonoBehaviour {
    public static SaveData SaveData;
    private static string  SavePath => $"{Application.persistentDataPath}/save.game";
    private BinaryFormatter _formatter = new BinaryFormatter();

    void Start() {
        Load();
    }

    public void Save() {
        var json = JsonUtility.ToJson(SaveData);

        using (var stream = new FileStream(SavePath,FileMode.Create)) {
            _formatter.Serialize(stream,EncryptDecrypt(json));
        }
    }

    public void Load() {

        if (!File.Exists(SavePath)) {
            SaveData = new SaveData() {
                Level = 1,
                Music = true,
                Sound = true,
                Vibrate = true,
                CurrentCharacter = CharacterType.Archer,
                UnlockedCharacters = new List<CharacterType>() {CharacterType.Archer}
            };

            Save();
        }


        using (var stream = new FileStream(SavePath,FileMode.Open)) {
            var data = (string)_formatter.Deserialize(stream);
            SaveData = JsonUtility.FromJson<SaveData>(EncryptDecrypt(data));
        }
    }

    [MenuItem("Developer/Delete Saved Game")]
    public static void DeleteSave() {
        if(File.Exists(SavePath)) File.Delete(SavePath);
    }

    private static string EncryptDecrypt(string textToEncrypt)
    {
        var inSb = new StringBuilder(textToEncrypt);
        var outSb = new StringBuilder(textToEncrypt.Length);
        for (var i = 0; i < textToEncrypt.Length; i++)
        {
            var c = inSb[i];
            c = (char)(c ^ 129);
            outSb.Append(c);
        }
        return outSb.ToString();
    }

}

public enum CharacterType {
    Archer,
    Warrior,
    Magician
}


[Serializable]
public class SaveData {
    public CharacterType CurrentCharacter;
    public List<CharacterType> UnlockedCharacters;
    public int Level;
    public bool Sound;
    public bool Music;
    public bool Vibrate;
}