Caution! Flying knights!
I loved the concept! Very original!
But I think you could push the idea even a bit further, because the princess was a bit useless here. What about some pick-up the princess and feed her to the monster? Or activate some evil mechanism to kill the princess and get swallowed by the monster?
Otherwise the puzzles were ok, not too difficult but still interesting. The last levels with switches were cool but a bit confusing.