I came very, VERY close to scrapping my project, specially when I realised I had miscalculated and was one whole day off-schedule but at the end I chose to just cut a huge amount of content and make a smaller, more possible game. Part of the appeal for me was to get something done, at any cost really, to not miss the deadline. It was my first time doing a jam so I understand where you're coming form and I had a lot of the same feelings, down to playing some ToTK and then snapping back to reality and turning it off to continue working on the game. I wish you better luck next time! For me it worked to try to map out the whole week in chunks and adhere to it ruthlessly to avoid getting caught up in small-picture stuff (I also have a tendency to fixate on what you call "silly details"). My two cents!