What is the principal resolution mechanic? Are there character advancement options? Does this game play for one-shots or can it be used for protracted campaigns? What other resources are contained within this book? I am intrigued, but the free preview does not give very much information. It's a $15 PDF, so I am hesitant to purchase based on so little game information. Is there a YouTube actual play video? Or a playtest document? Somewhere we can learn more about the actual game? Thank you.