Is it a good idea to involve the user in a demo?

There's a page on my company's website that demos/tours/guides the user through our app. Is it a good idea to involve the user in the demo/tour/guide?

For example:

• "Click [button X] and we'll show you what it does!"
• "Try out the feature we showed you!"

The online demo/tour/guide not a complete version of the app, of course.