Google Play app ratings and user reviews affect how Android users see your app. By looking through your app’s ratings and reviews, a person can determine whether 1. Your app works well, and 2. your app solves their problem. From there, a person will decide if they want to download your app. Of course, you want to do everything you can to convince them that your app is worth their time. Replying to Google Play reviews pushes you closer to that goal.