Chromebook flip can't download android apps

[AC Question]

I have a Chromebook flip in developers mode and am using the play store which I got from the chrome OS store and all it does is direct me to more web apps . Mostly it says what apps I ready have installed and list all devices as my options to download them to . How do I enable my Chromebook to the list of devices it allows apps to be downloaded to and why does it only offer me the chrome OS versions even though it's the play store ?