This caught my eye because I'm a lurker here on Hacker News who actually plays this game! I'm super excited you are posting here because I really want to learn more about your server architecture. Can you provide more info on your java stack as well as the kind of hardware is running the site? Previous games had 300+ users, so scalability shouldn't be an issue yet, but have you planned for that?

Once criticism: For the time I've been playing, the game has been evolving rather quickly, and new features seem to have taken precedence over client stability.