Good but has issues
The drawings are all excellent, however the animation isn't consistent. Sometimes it's amazing while others it feels like major corners were cut.
There are problems with the story as well. Because it's been so long since the last one was, out I forgot basically everything that happened in the previous episode. It would be nice if there was a recap, or if nothing else, a links t the beginning of the movie to the previous episode.
These problems are compounded by the fact that the episodes are basically one long move, with no episode specific subplots to help make it more memorable.
In this movie, even the main plot didn't seem to flow well towards the end. On minute the wizard is in her castle or whatever, a second later she's outside fighting the princess, with no scene to show how she got there...not even a teleport or something.
Finally, and this has long been an issue with the series, the sound quality badly needs to be improved. It doesn't do justice to the animation and actually takes away from it.
With all that said, I thoroughly enjoy this series and look forward to the next installments. While it's too late to address some of the issues, making sure the rest of the plot flows smoothly, making sure the animation quality is consistent, and improving the sound quality would really make the final episodes in the series stand out. Good luck!