It took me much more effort than I thought was necessary to understand the rules for Lady Blackbird; more specifically, things should be stated explicitly (such as what, exactly, a Key is) rather than left for the reader to infer (from specific Key descriptions on the character sheets, and from the rules summary about Keys which says vague things like "hitting a Key" without saying what that means!). I have a hard time imagining people who aren't already very familiar with RPG design and rules-light systems "getting" the rules as written without outside help.