Unique

2 stars for being an unique app (I must say I have never come across something lke this - it amazes me what these developers think of), and 1 star for putting it in writing that the updates will always be free. To get the 4th star, the updates will have to be often and add value, but I dont really expect much on a 0.99 app. Still, this was something fun to spend some money and time on.

MaranSubramaniam about Optical Illusions+