It took over an hour to finish off the boss, as I had several failures, but eventually he was defeated. There were then four (or five?) “Game Over” sequences, including two more after it declared “Fin”, and then it was finally over. Now there are some extra challenges to complete, but I haven’t a clue how to go about accessing them. The books on the bookshelf are mostly empty still too.
Total play time: 12 hours 27 minutes.