You can try advertising your game (in the right places, of course) in forums such as these. Perhaps you can also try to interact with other people, rate & comment on their games, and maybe they might return the favor. Maybe collaborating with someone on a game could work, too. Entering game jams would also bring some exposure to your games.
I can see your game in games on sale when I click on the "new & popular" and "most recent" filters, though, so definitely someone will see it. :)
I claimed and downloaded the game, so now for the feedback part: The concept and gameplay are great and it has a lot of potential! :D Especially since you can turn the ring and shoot missiles and black holes so this makes the game interesting! The art is also nice, too. Although sometimes asteroids strike the planets on the four corners of the ring, and since we can only shoot in four directions, it is a little hard to aim it correctly. Turning the ring might help, though. Also, I think it might be useful to have a cursor when you are not playing. Aside from that, it is a great game! :D