Sorry but...
This indeed -is- nothing more but site advertisement. Why? Well:
1. The movie was too short and is suitable as merely an intro to something bigger.
2. There was little to -no- plot and the whole point of the thing was to present the viewer with a link to your website.
3. There is no entertainment value. The true entertainment value is within your website. To get there, you click the link in the movie. And thus, once again, this is merely advertisement.
4. Advertisement is not defined by linkin to online gambling or long distance sales. Advertisement is everything that has no larger purpose than to refer to a specific product and proclaim it's existance or the likes. That is what you did.
ad·ver·tise·ment ( P ) Pronunciation Key (advr-tzmnt)
n.
The act of advertising.
A notice, such as a poster or a paid announcement in the print, broadcast, or electronic media, designed to attract public attention or patronage. (Editor's note: Not neccessarily 'paid')
(Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.)