Well, I have only found this app recently, but its turned, by far, into one of my favourite apps; and the best, its free! Im a real "Touch Detective" fan, even though I have only played the DS games; furthermore, ever since I saw funghi I thought he deserved his own game.
The game is gripping and motivates you to play in order to get the incredibly cute wallpapers and complete the "Library". The art, such as in "Touch Detective" games is amazing. The app is user friendly and can easily be managed by anyone.
So, my overall opinion about this app is that its a must-download and really awesome even with its simplicity.