One interesting plot could be the goose forming an unlikely friendship with another animal in the village. For example, the goose and the cat team up to prank the villagers in a more elaborate way than the goose could do alone.
The 'untitled goose game' is about a naughty goose causing mischief in a village. The goose goes around stealing items, honking at villagers, and generally disrupting the peaceful village life.
A crossover with Minecraft would also be cool. The goose could waddle into the blocky world, disrupt the building projects of the players. It might steal their resources like diamonds or iron, and peck at the creepers just for fun.
The main character is the goose, of course. And there are various villagers like the gardener, the boy, the shopkeeper, etc. who interact with the goose.
First, decide which universe you want to crossover with. Then, think about how the goose's personality and actions would fit into that new world. For example, if it's a crossover with a fantasy world, the goose might be seen as a strange magical creature.
The village dog could be a main character too. It could be constantly chasing the goose or getting tricked by the goose into chasing its own tail. It might also have a soft side and end up befriending the goose in an unexpected turn of events.
A simple plot could be the goose getting lost in a new area of the village that has never been explored before. It then has to find its way back while causing chaos along the way.
The geese themselves would be obvious main characters. Each goose could have different traits, like one being the brave leader, another being the cautious one.
Maybe there's a goose that discovers a hidden shortcut on the game board. This goose then has to decide whether to share it with the other geese or keep it for an advantage in the game. The story could follow the moral dilemma and the chaos it causes among the geese and other players.