sewage key is wrong in help. should be a t not r. But I figured it out :)
You are the mayor of the town. In level 1, you will create factories and earn a bunch of money, but you will realize the consequences of your action when the area has been polluted by the factories. At level 2, you will try to fix the problem that you have created in level 2.
This game is trying to show the consequences of not caring for the animals and how to fix the problems we have created. However, there can be 3 endings in this game (2 sad endings and 1 happy ending).