I've just discovered that my installed component is visible to Administrators, but not Managers. This is half good half bad since I discovered it while trying to limit certain views from anyone except Superusers.

I've read the Joomla tutorials, but am confused about how to have my component appear in the backend for any backend user, but two of the views should not be visible to anyone except the Super User.

There is an important ACL missing. The simple access for viewing is not available.
You cannot define wich page to acces or not.

You must define it manually.
Code it in VIEW.HTML.PHP at the beginning of displayXxxx()

Hope it helps.