A common comment we've heard from players is "I didn't even know about this game until I saw it on Steam" which suggests, yes, we are failing at marketing and need to do more.
We're looking into our marketing options and are talking to a number of companies at the moment which should see the visibility of the game increase, although we do welcome any advice or suggestions.
After May 1st, Kon will let me get back to working on in-game guild support (Alliances) and Hero customisation. I have plans in place for what I want to achieve, it's just a matter of having the time to add it in, which I should have soon. I agree that guilds and customisation will give players a greater sense of ownership.