DDR, I played through the game standalone for mac and it is a wonderful game! I had to quit the app and re-open it though in order to play the 3 "Yenna Key", "Gas-Lamp" and "Wuthering Heights" as the game stops working after you finish any of them. I also, could not advance further from those 3. But I suppose all of that is because it was meant as a demo.
Well, it is a very simple and interesting idea and, though I suppose I saw only the beginning of it, I can tell you that it is a wonderful game, congrats!