I don't like floating elements like that; it's distracting. When I first load the page, it's
just lined up with the 'H', 'w' and the sign-up graphic. That feels out of place. Personally, I don't like floating elements like that because it violates what a website is, to me. I want to navigate through information, and I bristle when information is forced on me like that.
Consider the amount of "special" things you have:
- Floating feedback link on the left
- "Sign Up" link/tab is highlighted red. (This also means I have to use some small cognitive effort to realize "Home" is black because I'm there, "Sign Up" is highlighted, and the rest are normal links.)
- "call you" in the blue banner is both bold and italic
- Lead-in text is bold
- "calls you" in lead paragraph is bold, italic and green
- green check marks for the features list
- Play button on your UI graphic
There's nothing inherently wrong with any one of these things, but they're all design elements that say "I'm important! Look at me!" But when I see seven competing things evenly spread out over the page saying "Look at me!" my first reaction is to give up and look at nothing.
I think it's possible to include the same amount of information, just presented in a clearer way. Personally, I think the star of your show are your UI pictures.
Of course, keep in mind I am, like you, a hacker, not a designer. But I'm taking the time to explain what I see because I think you've come up with a neat idea for what sounds like an untapped market, and I'd hate to see you run into problems because of simple presentation issues.