You can change your app from being a paid application to a free one.

To publish your Android app at Google Play, you should create an account which will allow you to publish as many applications as you want on Google Play. This account’s fee is:

User experience (UX) designers and information architects use wireframes and prototypes to show navigation paths between activities.

It is recommended to add some features to your to reflect your professionalism, where it is not recommended to make your app simple.