Weak and unintuitive editing options

This app is terrible, dont let yourselves be fooled by the good looking icon, all you can do really is adjust perspective on an axis or another, you dont have the possibility to eat her stretch from a corner or anything and the worst part is that it is never clear wether you can go back to a previous state and when the photo is saved.
This app is VERY limited and VERY unintuitive.
Oh and iPad users, no landscape mode folks!

Veurlatonra about Perspective Correct - Fix distortion and skewed pictures with keystone and straighten correction from camera or photo library, v2.5