Once upon a flower is a game in which you have to take care of a newborn sign of life- flower, you do that by clicking a screen or pressing space when a drop of water is inside a flower. For each drop(which leaves a blue mark) you collect you get 25 points, and the flower stops shrinking. If you manage to get a drop of water in the center(which will leave a yellow mark) you  get  100 points and the flower will grow!  Be  careful not to waste water droplets (if you miss 3  it's game over)