ProjectDDD/Assets/_DDD/_Scripts/GameState/GameState.cs

using UnityEngine;
using UnityEngine.AddressableAssets;

namespace DDD
{
    public class GameState : ScriptSingleton<GameState>
    {
        [SerializeField] private AssetReference _gameLevelState;
        
        public GameLevelState LevelState { get; private set; }

        private void OnEnable()
        {
            LevelState = CreateInstance<GameLevelState>();
        }
    }
}