Moving to something even more Ajax based, like mafia wars would be a good idea.
I liked the users online incentives for players online across the top, but should be bundled with a call to action telling me how I help raise that number (though invites). I'd add an incentive based bar for more virality (Like, bookmark, extended permissions and we'll give you energy/coins/unique gear) and adds channels for you to communicate with users.
Some kind of a play rating (a simple number) that tells me how well I'm doing in relation to others is also a good idea, so long as it points out how I can raise it. People like getting graded.
I should be able to pay my way to end game, even if the amount of money required is obscene. If you're looking to make money, let me pay to cut out a whole segment of play to see what happens next.
Other than that, pretty cool. I enjoyed playing.