Theme

So the easy way to approach this is from the players point of view - playability. Select a SIMPLE theme idea. Don't bog down in the historical and technical. Keep it light and add to the theme as you need to. I write novels and term papers. Coming up with a theme is really hard because you want to do a lot that's going to read well. But with each project or paper, I make myself sit down and reduce the ideas into a single idea or theme. Throw out everything unnecessary and start with a solid foundation, then build a great "house" or er game in this case. Best advice I can give.