public GameData CollectGameData()
        {
            GameData savingData = new GameData();

            savingData.activeTiles = placementTilesHolder.CountActiveTiles();
            savingData.coins       = CurrencyManager.instance.GetCurrency();
            savingData.currentWave = enemySpawner.CurrentWave;
            savingData.maxWave     = enemySpawner.MaxWave;
            savingData.gatesHp     = castle.maxHealth;

            savingData.upgradeSaveDatas = upgradeSystem.GetUpgradeSaveData();
            savingData.towerSaveDatas   = CollectTowerSaveData();

            return(savingData);
        }