You can preview a game page before it's public, sure. The "view page" link is always available to you and active, once you've saved the project.
Thanks for the reply. Maybe I'm being dense but I don't see the Trailer I thought I included -- I see description of the game, and I can play the game, but I can't see how to review the Youtube video intro I specified as a trailer, to verify that it's working as a Trailer. Sorry about the image below but I can't seem to suppress it when I paste the link here . . .