Okay, I started to figure it out. Cut down trees, put the logs in the furnace, and kill the ghosts so they stop destroying your buildings. And if you walk on the snow it turns to ice which makes it more complicated.
I like the idea, I think you might benefit from a new first level that acts like a tutorial and shows you how to play before just launching a person into it. The graphics and sound are good, the movement system is a bit slippy, but I think it's supposed to be. Trying to figure out where to add the log into the furnace is sometimes tricky. Some indication or pop up might be good for that too. Otherwise a good take on the theme.