I like this game a lot. And not just because i love to build things or manage more than see action.
Other than the well balanced creation system (reminds me of cooking mama, lol), I enjoy the little things that you have added in here- helpful parts like the rims of the melting pots changing color to match whatever Ore i put in, and even the non-gameplay related things like seeing the jacksmith's eyes follow my mouse cursor as I moved it around.
I always know when I've played a quality game by how much time elapses before I catch on that I've been playing a webgame for hours. I spent five hours today before my stomach reminded me that I needed food. Well done! :)