Well... that's a bummer!!! We know! 
However, it seems that you clicked on a link from one of our announcements that we sent over email or one of our newsletters, on a desktop / laptop device. The haatch. - Goal & Habit Tracker app is only available as a mobile application and, therefore, when you click on a link from an email on a desktop or a laptop device we have no actual place where we can send you :), as those links are actually designed to open the app itself when tapped from a mobile email client. 
Kindly return to the email and access it via your mobile device to ensure access to the content within the application. 
Thank you for understanding!