I completed all the levels, I like the music during the ending cutscene.
The game could have been found on an old NES cartridge, it perfectly looks, sounds and plays like a NES game. I can't state that enough as with some other entries which kind of do I can't help but wonder if what's happening on the screen would be as smooth on an actual console, here I have 0 doubt it would work exactly the same, I think it's one of the strongest games of the jam in that regard. And I like how it looks, I like how it sounds and I like how it plays. The game mixes well known mechanics into a unique one which is very fun to apprehend and works very well. I'll reiterate that it's exactly a mechanic you could have find on an NES cartridge, and the levels make good use of it.
I faced the negative princess thing a couple of times which was confusing the first times but eventually didn't matter much as what might take time is figuring out to beat a level (although in practice it never gets that hard) but never executing it. Also if I'm getting harsh I would say I was left hungry for more as the game ends before you gets to face one proper hard puzzle which gives you hard time, but what I got was already very fun.
Great one!