I don't have any experience in making games and posting them on the Google Play Store, but I am a Google Play Store user, and I would suggest if you ever do decide to make a game and post it on the Google Play Store, make sure you create a fan base for it before you release the game. Hype the game up, make a trailer and upload it onto YouTube, and the most important thing is to make sure you have an open beta test for the game. In my opinion, that's the best way for people to know about your game. Since the Google Play Store has a section for Beta Testing games, its really easy for people to find out about your game. That's all I have to say. Good luck!