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I think you should draw more attention to the fox in the ending so it is a bit more clear that he is there. I noticed only after seing a comment about it and looking for it. 

You could do it by maybe have the world get a lot darker after the code is inputed and the fox is being a lightsource. Then you will see the fox looking up(the looking up could be repeated or more exagerated) and you will look up. That would also make the change in the amount of sunlight when the sun comes down much more visible.