There is still a problem with not always getting a response from the Google tokeninfo endpoint. I'd say about 25% of the time, the user will have to click "try again" to be logged in.
Should create a user admin page, but there's no hurry since I'm the only admin and the only extra thing an admin can do is add templates, which you need server access for.
Functionality added in release v2.0.0.
Outstanding issues: