If you plan to make more games in the future, here's a quick online marketing 101 "walk-through":
1) Setup a blog
2) Throw in a link to your website in all games
3) Start blogging about your latest games, the progress, the difficulties you run into etc.
4) Setup social media accounts (especially Twitter and Facebook), and start sharing your blog posts, latest games, retweet interesting tweets on Twitter, and post games-related images on Facebook.
5) Make sure that all your games, blogs, and social media accounts have links to each other, so that people can always follow you where ever they are.
Slowly but steadily you'll start building an audience, and you'll start seeing an increase in downloads. Marketing this way (which is free, by the way) takes time, and you shouldn't expect results overnight. But in the long run, this will help you, and you will start building a fan-base, which you can then move to your newer games once they're ready.