Seriously?

Has anyone really got this to work? It successfully allows you to drag it in one direction…and create distortion in another. Seriously? The solution is to crop! Seriously? Come on guys. We should be able to keep our entire photo!
Update: I had taken a picture of a completed 1000 piece puzzle. My goal is to have 4 square corners. I am unable to do that with this app.

bruson about Perspective Correct - Fix distortion and skewed pictures with keystone and straighten correction from camera or photo library