Google app is the bestest software till date which allows you to download unlimited apps and games of various kinds for Android.
The best thing about Google Play is that one can find anything that suits his/her needs. One can find a hotel app or cooking app and the list goes on. I personally like productivity related apps more like fabulous inshorts or appdetox etc .
The UI is quite good one can slide through all the apps very easily. The apps section can be segregated as follow: top paid, top free, latest paid apps, or latest free apps or top grossing apps. If u like one app u can see more related apps as well since it provides you with that option too. Overall it is a complete package.