4 stars because I love the concept of shaping a planet and getting points based on what's on it.
However, there's a lot of flaws in the game. First of all is the lack of information about what on earth is going on. A basic tutorial could be a great way to answer the following:
Why does the blue tick bar (under Planet Points) move at different, seemingly random speeds? What is its effect on the world generation?
What are the effects of fauna and flora? On forests? And settlements?
Why do forests sometimes disappear?
What effects on the world generation does buying upgrades for grass/forests/rainforests have?
Why can villages sometimes evolve into cities on their own, but never (seemingly) into modern cities without the aid of clicking?
Other than that, the zoom could be designed better. Using the mouse wheel scrolls the page, and it's only possible to zoom in on the centre of the world, not an area near the poles.