I'm ashamed to admit it, but I am a fan of the app Happy Street.
In Happy Street you basically build houses and stores and other buildings for the people of your street and you try to complete all the missions the populous asks of you. You can also craft things and go fishing and play a few other mini-games in the app. This is a casual kids game all the way but man is it ever addictive.
Happy Street reminds me a lot of the extremely popular app Smurfs Village where you build a village for your Smurfs. Smurfs Village remains to date one of the highest grossing apps ever- even though the game is free- because of a little thing called Smurf berries. These berries speed up times to build things, go you special items, as well as other bonus things and just all around made the game better. But you get the berries you had to fork over real life money, which has earned the creators millions and caused a insane jump in the number of games that were based of this simple philosophy. This is why if you look at the top twenty grossing apps in the App Market, you'll notice that usually around 16 or more of them are free and rely solely on in app purchases. And this is exactly what happens in Happy Street, except instead of Smurf Berries, you're prompted to buy Flooz.
Regardless Happy Street is still an addictive (in a good way) and fun game that I encourage you to check out. You can get it for free here on the Play Store.