The princess is saved.
My highscore was 60150 points, I died once in Level 38 and I wonder if it was due to a bug as regular enemies went on coming during the boss fight which might or might not be intentional.
Although the visuals don't propose some traditional distinctive NES look the game follows the limitations which is more important and I think that gameplay wise it's totally a game I could have played on a NES. The difficulty was perfect for me for the jam, the midway twist and following level numbering are nice touches and I had fun playing.
Cool!