While this game is very polished and has beautiful graphics, music, and achievements (always a plus for me personally), the gameplay leaves a lot to be desired. If feels very unfinished due to that, even though at first glace one would assume the complete opposite. Now, I didn't get very far into the game so maybe things picked up, but it was not able to keep my interest for that long.
I didn't really understand why he would be mining, and why he would start with a pickaxe instead of an axe. It felt like an unnecessary element, especially when thinking of the story. Jack got the beans because he was selling his and his mother's only source of wealth; a cow who had stopped producing milk. During the story, Jack brings back a large sum of wealth, a hen that lays golden eggs, and a harp that plays itself. I don't see when or how Jack's son would get into mining. Maybe if there was some explanation to that somehow, something summing up the events between the end of Jack and the Beanstalk and the beginning of this game, explaining the situation. When did he get a son, what's the story behind that? Where is he and his mother now? I didn't finish the game so maybe there is some explanations to these questions later on, but I saw no room for story growth.
Overall you did a great job with the esthetics, and the achievements are rather nice, but the unfinished feel to the gameplay and story development still shows, and I wish the gameplay was equal to the graphics.