What a glorious game!
Maybe a few small extra things that can be polished:
1) Don't cut the music when showing the end-game screen, it's such a nice track.
2) The character movement by just gliding without any sound is a bit awkward, maybe add some waddle animation to the sprite and/or some light taps for the sound.
3) Add some decoration to the levels. I assume the settling is inside some castle, so something like nice red carpets, some candelabra and maybe armor stands and weapon racks? Would make the game much more pleasing to look at.
P.S. only after completing the game I found out that RMB was to rotate pieces :facepalm: