To put it concisely, I've tried to explain the rationality ideas (like recursive self-improvement, expected value, probability, etc...) in text. The characters just talk about these ideas in context of the story, but it doesn't feel any different than, say, reading the Sequences. It's not engaging any different parts of the brain. To create a really good game that increases rationality, these ideas will have to be deeply embedded in the gameplay itself. Once I am completely done with the game, I'll write up a postmortem where I'll go into more details about this.