Would love to know if a walkthrough exists, too. For the specific part you mentioned, just interact with one of the columns (if you stand in the center and face the key, it should be one of the columns in the row to your left) and it will descend and allow access.
EDIT: someone else graciously provided this link! It's an archived version of an old website that has the walkthrough. http://web.archive.org/web/20080224161547/http://killingtime.home.mindspring.com
Note, for some reason clicking the link just takes me to the non-archived version, which is long gone, but if you copy-paste that link into your URL bar, it should work.
I'll have to reinstall the game because I got frustrated and uninstalled it. I just wish there was a way to make the videos look better, too.