Definitely check out this article about game promotion:
http://fireside.gamejolt.com/post/increasing-your-games-presence-in-the-online-community-vrkmrdvqI have not had a lot of success with game marketing, so take my advice with a grain of salt, but here are a few things I've learned and am trying to apply to the marketing of my latest project:
-try to get good reviews from people you trust, like friends, family, and other developers
-use the #GameDev hashtag on Twitter to reach a wide number of followers
-if you can get a YouTube celebrity to play your game, which isn't easy and I've never succeeded, you can totally become a big deal really quickly
-I haven't used this yet myself, but consider trying to integrate a cross-promotion ad service like
http://www.moregamers.com/ into your project
Speaking of marketing, my latest Android game is called Uncle Scotty's Arcade At The End Of The Universe (AATEOTU). Please check it out on Google Play if you have an Android device and a few spare minutes, and leave a review if you enjoy it! Thanks
https://play.google.com/store/apps/details?id=com.AnachronicDesigns.AATEOTU