Hi folks, you are right that the app is missing from the store. We are working hard to get a new release in, if you would like to help us test, please click the link below. We have a release ready..
http://testflightapp.com/join/fa146329b009914500c39bf3b96365d4-MzQ1NQ/
The last update broke mine, too. Last week, I think. Crashed repeatedly on opening so I deleted it, thinking I'd just reinstall. Nope. It's not presently in the App Store but I guess now I'll have to check daily since without the broken app installed, I won't get the notification when the fix is available.
If your app is still working, you didn't update it. Lucky you.