Samantha and I, with a great deal of invaluable help from a friend of ours, John Kricorian, have developed a board game, but it is not ready yet. I'm writing a novel that was inspired by a drawing that Samantha made, and the book will also include the characters and the settings we created for the game. As the story develops, it will probably result in additions to the game. The book will also include cameos from at least a couple of the characters in Sasha and Samantha Save the World.
In the meantime, here's a link to an H. P. Lovecraft-inspired, online zombie game that I have enjoyed playing many times over the last ten or so years: De-Animator.