Thanks for the reply, @gludion :-) Those are really interesting points! I really like the idea of a game centering on the concept of being open to stimuli but not following them. It has my wheels turning with ideas.
Most of the concepts in my head right now are playful reminders of mindfulness concepts (not following thoughts, returning to your center, focusing on gratitude, etc.)
For me, it's so easy to pick up my phone and start mindlessly using it - scrolling through twitter or playing a puzzle game or whatever. I want to mobile create games that tap the player back into their intention (because it's so easy to forget when going about a busy, online day).