My preference for game apps is easy to see:
1. Easy and intuitive features
2. Unique gameplay
3. Atmospheric background music
4. Last but not the least, very beautiful illustrations
And Monument Valley was able to deliver all above stated reference.
Monument Valley is an illusory architectural gameplay dealing with twists on geometrical references that would make a joke of brain logic. That is where the beauty lies.
Below are the inspiring images of the game. I didn’t add all screencaps to avoid spoilers of course. You have to play the game yourself and be amazed.