What influence keyword ranking? This formula is made up mainly as follows: Total downloads + application downloads on a particular keyword + keyword search competition (how many apps on the keyword “dating”?). Here is a full list of keyword ranking factors:
For example, when you do a promo “App gone free” or give a discount on your app, increasing of the install is guaranteed. And then there is a good chance to get higher keyword positions. See the results on the app example of kid’s apps.