What makes an Android app a killer app? How do you make your own project scale from a few dozens to millions of users? How do you engage users all over the world? How do you put a spotlight on your app, so anyone can discover it? An Android app is not just what the app does, and it's not just how you developed it. It's about how you build an ecosystem around it. It's about how do you improve your app to accommodate it to users, and how you make users comfortable with your app. It's about how you listen to your customers to make it awesome. It's going the extra-mile and transform an app from cool to magic. In this talk we will discuss some strategies to improve the impact of Android apps, from multiple points of view: from app development to code optimization, from basic graphical assets to awesome eye-candy UI, from catchy features to user deep engagement. We will see how using the latest features compares to backward compatibility regarding user impact, and how monetization and social marketing strategies can help an Android app reach that million-downloads milestone.