The fun stems from your social interaction with the other players. Since you're pretty much always in a position where your knowledge about others is limited and/or based on who you think you can trust, an interesting playing dynamic evolves, where two people playing for the same team might have the same or very contradictory beliefs. The meeting gives players a safe time to discuss their findings with everyone and work out whether they have high enough suspicion to warrant voting out a person to be executed. Every time a corpse is discovered, players can call in a meeting. Another way for them to win is by collectively figuring out who the murderers are. If all duties are done, the good guys (geese) win. These duties are essentially the time limit in which the murderers (ducks) need to get their murdering done.
You walk around a map with a list of duties to take care of, which are essentially simple micro-games where you need to click or drag your mouse to do several simple things like clean a mirror or wash the dishes. In GGD you're either working together to find out who the murderers among you are, or you are said murderer trying to get away with it. For anyone familiar with the game Among us, skip to the next paragraph. Goose Goose Duck (GGD) is an excellent social deception/deduction game.
