A new and last demo of the game will be released soon, including the first 4 levels of the game (in order), an introductory scene that explains Mu's motivation to travel the world,  and  the use of "magic heat stones" (the one you throw on the geyser at the end of each level); So stay tuned folks ;)

*I've uploaded a video of the introduction in my twitter account if anyone wants to see what it is about