analog game constraint: make a game that changes based on the time of day
creative code constraint: make something that grows from a seed
mix, match, or ignore prompt/constraints as best suits you. the prompt is a starting point, but it doesn't need to be an end point—let yourself wander.
whenever you notice a window, look outside. if you can see the sun or the moon or the stars, note where they are. what is the quality of the light?
this game can be played at all hours of the day or night.