I just submitted an Android app to the Amazon App Store for approval. I tested it and it passed the Amazon tests. It is scheduled to be reviewed within the next 24 hours. However, I would like to limit downloads to a select group of testers for now since there are many more features I'd like to add before going public. How may I accomplish this? Also, I delayed the desired publishing date to 6 months in the future to give me time to add those features. Thank you in advance!