Absolutely good advise.... but much easier said than done! We're already 7hrs into this jam as I write so I guess I ought to have a working game by now and switch to the polishing stages - well I'm not even close! (Its all coming along though!)
Viewing post in The 4:44 Rule (or maybe in this case the 7:65 rule)
As always, you do what you can as best you can, but it's just a good rule of thumb to follow, especially if you know that you tend to overscope or have content creep. This will force me to stay nimble and focused because I tend to overscope on my projects. I also just chose my idea, so I know that I need to get it up and running as quickly as possible and see if it has legs or not.