This is a game I want to love but can't; simple, interesting idea but poor execution.
Unique rules (find the fragment of a picture that matches the fragment shown).
Tests visual recognition. Other than Spot the Difference, I can't think of any other games that do.
There is no thought put into having consistency in difficulty between - or even within - pictures. A picture with 6 differently coloured squares would test no-one but the colourblind. A fragment could either be a clear portion of a shape or an indistinct part of an out-of-focus background.
I found the picture with green peppers an interesting challenge - having to distinguish identically hued shapes that ARE (barely) distinguishable.
Lesson: even if all your 'game design' seems to involve is making pictures, there's probably still a lot to think about.