I am looking forward to seeing this system rendered out. Memory is a good theme to base your mechanics on, since Twine allows you to deliver so focused information to the player. As we discussed in class, remember to keep in mind the behavior you wish to reward: should players go into the Island of Memories and remember what they see, in order to defeat the shadow? Should they spend time and collect stones, to use in the context of strength? Should they demonstrate their good judgment when making choices in the Wisdom path? The more explicit and specific you make these decisions, the strongest the theme will be, in the eyes of the player.