Version 3.5.3 out now - Fixes the level error and adds some new features.
if you require your script to be loaded with the Joomla mediaversion query var - just add "mediaversion" to the content tag after headtag:script or headtag:stylesheet
All of these options are available in the plugin configuration for access level, user group, and menu item.
I think we have to install 3.5.3 manually on our sites one more time to get the new update server URL. After this it will use this new URL and then we should get a notification of new versions, right? Thanks!