I really dislike the 50% chance of success/failure. Shirley, that can adjusted a little by the black lettered descriptions which lose their strength turning blue? Can I call you Shirley? Sorry.
However! The whole thing is great and doesn't rely on a lot of die rolls for anything much. Getting a solid story telling experience out of it seems to be the important part here, although the uncertainty of what becoming blue means should weigh constantly on everyone's thoughts and actions. Spooky!