Marketing your game for $0

It's always important to let users know about your product. For startups, especially, users won't come to you themselves, instead you go out there and get them.

HOW? Well, this is what we call marketing.

So, if you wanna earn from your games, buckle up your belts and read the following tips to monetize and market and your game with no budget.

Facebook Groups

Thanks to Zuckerberg who found a way for such large scale user engagement.
Post your stuff in various groups with relevant content. It will not only help you to get more downloads but also let you interact with other like minded people around the world.
Following are few groups you can start with:

• Indie Game Developers
• Indie Game Advertising 
• The Gaming Society

Twitter Events

On twitter, there is atleast one dedictaed event for game devs everyday. 

For example, #screenshotsaturday, #indiedevhour, etc. Follow the trend, post your stuff with the hashtag and get many followers everyday. Again, be relevant with the content (say no to memes :p).

Lastly, I'd like you to read an article Do Things That Don't Scale written back in 2013 by Paul Graham. New startups and indies will learn alot from this.