Error you will see when uploading to Google Play
"Your APK's package name must be in the following format "com.example.myapp". It may contain letters (a-z), numbers, and underscores (_). It must start with a lowercase character."
After you have signed and aligned your new app.
Awesome instructions on how to do that here.
https://www.scirra.com/tutorials/432/android-games-with-cocoonjs
Next you go to upload to Google Play but you get the above error.
I found a simple fix.
When you are compiling in cocoonJS make sure your bundle id is in lower case as well as application name.
Manage project> Edit configuration
[Application name]
[BundleID]
I found simply changing the app name by renaming did not fix the error when I tried to upload to Google this approach did.