Your post prompted me to download the app and my first impressions are that the simplicity of the app is a huge selling point. No pointless nav bars, no curious looking buttons, no walls of text, simple, effective UI. I really like it. Hopefully it will help me drop a few kg's!
"huge selling point" is exactly the problem. I liked the post as well, it was very descriptive. But, I feel like he gave up by making it free. I'd be more interested if he can turn it around to profit. Although this was much easier to do in the early days of the app store. Less so now.
As an app developer, overall I feel these posts only encourage the current app store ecosystem of free or freemium.