Yes, I filled in the time in the first 2 days by using it to write the design of the game, which is also something I normally don't take the time to do.
One advantage I can see until now is that I know pretty much exactly what I have to do every day. I use the smaller steps to either do design, research or to refactor the code.
The game is written in JaveScript using html5's canvas element, which is supported natively on the latest versions of firefox, chrome, safari and opera. Sadly microsoft doesn't seem to put canvas support at a very high priority, so IE users will have to use one of the other browser if they'd want to play the game.
-Ido.