A Beautiful game built around a solid enough mechanical core, although it does suffer from some awkwardness in the controls. My main criticism would be that it really didn't take the theme of the Jam into it's design in any meaningful way, especially in terms of what the authors have stated is their connection to that theme.
This book is frankly brilliant, and I haven't seen a group jump to play something from just the pitch as quickly as they have for this. If I have one criticism, it's that the book takes a lot of time telling you what the fluff is, or what the subtext for a playbook is. RPG's are about finding what resonates with you in what's there, but I doubt Erika is going to break down my door when I use the Witch playbook for a Zen Monk or what have you.
To be specific, it's really impressive you've basically made a strategy (that strategy being "how do I figure out where I'm going with the lamp time I have") game out of this small number of parts.
