private void Awake()
    {
        go = GetComponent <Button>();


        //ゲーム開始&リトライ
        go.OnClickAsObservable()
        .Subscribe(_ =>
        {
            if (state.CurrentStateIsTitle)
            {
                state.ChangeToGamePlayState();
            }
            else if (state.CurrentStateIsResult)
            {
                state.ChangeToGamePlayState();
            }
        });

        //加速
        go.OnPointerDownAsObservable()
        .Subscribe(_ =>
        {
            if (state.CurrentStateIsGamePlay)
            {
                ship.Boost();
            }
        });

        //燃料切れ
        ship.CanBoost.Subscribe(c =>
        {
            if (state.CurrentStateIsGamePlay)
            {
                go.interactable = c;
            }
        });

        state.CurrentState.Subscribe(s =>
        {
            if (s == State.Result)
            {
                go.interactable = true;
            }
        });
    }