Honestly, there isn't a lot to go off of with the information provided. I think the idea has potential, especially for a game jam, but if you wanted to expand upon the idea, it might be a good idea to give the game a catch. Something unique with the art, gameplay, story, or something else. I like the idea of the gameplay changing slightly as you bring back more Autumn, which seems like it might be what you are going for. There are a lot of great ways this idea could be expanded upon, which makes this idea pretty good. Thumbs up.