Sorry, when I read the page I did not see anything about you needing to start a new project.
On the #DogeCoinGameJam page it says:
"Welcome to the Dogecoin game jam, hosted by Dogecoin creator Billy Markus! This will be a week long game jam accepting any submission that has any relation to Dogecoin. This game jam is to encourage and celebrate the creativity of the Dogecoin community.
Don't worry about the game being a masterpiece - all submissions related to Dogecoin will be appreciated and played!"
So IMHO it should have been submitted to help promote #DogeCoin, which is all most of us are trying to do.
But I would be more than willing to take it down if anyone feels cheated.
Or Billy Markus can choose to omit my project if it gets high ratings (no hard feelings).