Don't forget that app icon is the first thing that the potential users see. It appears wherever that's related to your app including search results, the app listings etc. Because of this app icon plays a critical role in your app's success.
Try to have an app icon for your app that'll be recognized and remembered by users from the first sight.
Here are some suggestions for when you're creating an app icon; Try to have a simple and easily recognizable image that people can notice quickly and forget slowly. And having words in your app icon may not be a good idea.