Thank you for your suggestion. Actually I was thinking about adding a story to the game. I thought of something similar to the story-line from the Zachtronics games. But I have chosen a different path. I think the game should be close to the "pure experience" of chess or go. Personally, I rather aim for simplicity and remove any part that is not essential to a pure geometric experience. Some of reasons for this approach are explained and elaborated on by Jonathan Blow in his famous talk "Video Games and the Human Condition".