Rules on Alien were great and one could write pages about the game and rules. Delving into rules for purpose of creating another game deserves its own topic imo. Rules worked with the game as it was designed. Would the rules have worked on a different layout or another theme? I guess the rules and video and sounds and music and design all meld together.
One unique thing about Alien wasn't software related, but it was integral to the success of the game, an LCD was embedded in playfield and a smaller one hung above it, still under glass. One displays what's on backglass and it is your status and the other shows situational info. This eliminated the need for a player to look away from the game. Easy to get mesmerized by 27" LCD in backbox though. Without that technology/feature, many would have never gone in on Alien preorder. Less money in means Heighway would have imploded sooner. Can someone make a t-shirt that shows a guy playing an Alien and reading - I saved pinball
One trend with rules has been to use one central display window to show game progress. JJP, Stern and Heighway have adopted this practice and did so at the moment they shifted to LCD screen. Games that are more complex require a second game screen and once again JJP, Stern and Heighway pinball did that also. Each has taken differing approaches as to what info to show and how. But LCD has become the norm and this has been embraced. I'd say you'd want to display your progress in the same way - all on one screen, so the rules need some structure.