Not bad, but the last key was kind of silly. The music wasn't really appropriate for the setting.
Author Comments
You woke up and found yourself in a strange castle. You have no idea how you got here and you don't know how to get out of here. Just when you think that it can't get any worse, you figured that it is the dragon's castle! Collect items, use them where you can and solve puzzles to get out of here!
Not a bad escape game, though the whole color-book in the piano room and the keys at the last room I felt that they were not obvious at all.
For the totally stumped there is a walkthrough here - https://www.youtube.com/watch?v=nIfyMSj62Wo