From the official website:
Do you ever want to be the God? Create trees, beasts, new humankind just by mysterious finger touch? Now, you have got the great opportunity to that. It is really easy. You should drag an element and combine it with another one. If it can combine you will discover new element. And so on and so on. Let's try to make mineral acids, discover alcohol, and even life on the way to the major goal. The final goal is the attempt to change base elements into gold. Be the most powerful alchemist in your own world.