For this game we chose to play the game with 4 Doomsday cards to make the game tougher for ourselves.
The Deluxe and Standard rules for this game are available online and as downloadable PDF documents, DeluxePdf and StandardPdf.
Go to the game design page with an animation of the Deluxe Rockets.
I am looking for a publisher for Doomsday, if you feel it is a good fit for your company then please contact me. @luckyredfish on twitter