That page causes Chrome to lag.
I would also say that if that page was any longer or any more information dense then it wouldn't work as a thing. It only works because there is so little content.
In general it depends what you're trying to sell. I've never actually purchased from one of these "flow" pages, but I have purchased a lot from more boring product pages like this:
The OP's sales page is definitely in fashion right now, in fact it looks like every current startup's page. But just because it is in fashion doesn't mean it is actually effective, and I've seen no evidence (and the OP supplies none) that it causes higher conversions than a "boring" sales page.