You did stay close to the plot of the film, but it was the differences, as much as the similarities that I enjoyed. You didn't try to put Mal, Zoe, Jayne, River, Simon, etc into the Merlin characters' bodies. That created a whole new story that was hugely enjoyable to read.
The dragon in the Mr Universe role was brilliant and the fact of magic in this 'verse was a great addition.
Thank you. This was such an imaginative variation on the movie.