This is kind of shooting way ahead but I think it would be pretty cool if when you started a new game you started at the beginning of any of the seasons. This would add some interest in difficulty if you started in winter (although I'm not sure you would be able to eat at all in that case, unless there was also the hunting system and you could say 'well, can't start a plant farm, can't do animal farm because I can't feed them with my non-existant plant farm, so I'll run around hunting).