The goal of the game is to keep the eco-system of a fish tank in balance as long as you can. What you can do for it - transmit music and light which influence behavior of fish, plants, and snails. They affect each other, but you should find proper equilibrium and balance life in the aquarium.
How it works: Light makes plants grow. Plants feed fish. Fish reproduce. Hungry fish eat fish. Parasites harm fish. Music speeds life up.