UPDATE: The hotkey issue has been resolved. The F12 hotkey has been changed to F10 to avoid issues with Steam screen capture.
A tutorial popup has been added at app start to assist a first-time user with proper Rustangelo usage. And app tips have been added throughout the drawing process to provide additional information to the user.
I don't have the new version packaged up for download and testing yet. I plan on releasing the new build next week for beta testing.
Thanks for the feedback everyone!