I love this game, and I can't wait to see what is released next. I play with several people online, and out of about 30, I've got about 10 of them playing now.
But regardless, I would like to see your game succeed, and I've been thinking of ways to help out.
One source of good publicity/ cheap advertising would be to put up flyers or have a table at Steampunk cons. I'm sure you are aware that these cons are all over the place. Here is a link with a list of some.
http://www.tor.com/blogs/2012/01/steampunk-cons-2012I think it would be a shame if your game wasn't exposed as much as it could be to a chunk of your target audience.
If the mods and the community are interested, how about a little competition.
Come up with an awesome poster/flyer design that best showcases what would draw steampunk fans to the game. Post it on the forums, and let the online army take them to cons.