First of all... its only a dollar.
Its a one trick pony, that trick is to produce the effect you see in the photos I posted. If you don't like that effect then you should avoid the app. You can take photos with it* or apply the effect to photos you already have. I like it a lot and use it and iFlashLight** on my 3GS the most.
* It always crops to square, but you can have it save the original photo.
** The best way to intelligently lighten photos, for the short period of time that I had an iPhone 4 I noticed there were a lot of file saving errors. I have no idea about now as my 3GS is still on 3.