Just a suggestion
It all pretty well thought out and the voice acting and music is of high quality too. One thing bothered me alot though.
And that was how you use the drawing tablet brush lines for the backgrounds and characters. This really gave the thing a sloppy look and took away alot from the smooth professional atmosphere. These type of lines work better for a more detailed background (i.e like in foamy or merry melony) than in a cartoony one.
I would suggest either to use the pen tool to make the thickness overall the same or by removing the outlines completely (like you did in a scene inside the castle) and only draw the character outlines with the pen tool. Really, it would look so much better this way.
AloneInTheDark