In order to read the site contents, you have to have contents to read. Instead there was a graph that moved around a bit when you scrolled down. Then there was a picture of a couple of dudes. Then there was a pair of glasses that rotated when you scrolled down. I generally read text, not pictures of dudes and eyewear.

It needs a sentence or two at the top of the page explaining what the app does and why I should be interested.

I'm viewing the content on a desktop web browser, not an iPhone. Maybe Safari renders this differently. In that case you should have text at the top saying "you need to have an iPhone to view this content."