Как делать бандлы думаю знаешь ? 
 https://www.assetstore.unity3d.com/en/#!/content/45836
Код
    using (WWW sceneLoaderConnection = new WWW("http://127.0.0.1:8080/unity/testscene"))
    {
        yield return sceneLoaderConnection;
        if (sceneLoaderConnection.error != null)
        {
            Debug.Log("Scene Download Error");
        }
     
        AssetBundle sceneBundle = sceneLoaderConnection.assetBundle;
        string scenePath = sceneBundle.GetAllScenePaths()[0];          
        Debug.Log("scenePath = " + scenePath);
        SceneManager.LoadScene(scenePath);
    }