This is a fantastic little system for a 72-hour game! I love the concept of a Hero in a Monster's body, the struggle of Good and Evil. I agree with the comment below about stat values. Reading through it, the skills + starts section was a bit confusing to me. It does feel very weighted to failure, which could be exactly what you were going for! :) So, if that was the intent, rock on.
I also appreciate that you included a section on improving and boosting skills and such. That really lends it to a campaign set-up instead of just a one-shot.