Roadball Rally - One week in the Google Play store

I published my first game, Roadball Rally, to the Google Play store a little over a week ago. Since that time it has been installed 26 times, earned a few 5 star reviews, and made $0.75 from advertising. Overall, it is about what I expected but still a bit discouraging. 

The feedback I've received has been positive but I haven't found a way to promote the game outside of my circle of friends, family, and coworkers. I have tried to promote the game on Twitter and a few forums and gaming communities without much of a response. 

I'm not giving up yet! My plan for the next few weeks is to tweak the gameplay a bit based on the feedback I've received and to add a few levels for the people who have already finished the game. I'm also hoping to publish a much needed iOS version in the next few weeks. After the iOS version is released I will make another push to promote game.

I'll post an update after the iOS version is released. In the meantime, if anyone has any game promotion tips, please let me know.