Incredible! Truly! I loved this demo beginning to end! The gameplay is incredibly fun, and while the controls don't exactly translate well to keyboard, I'd love to play this on Switch when it comes out.
I may not have a GBA, but I'd love to get this game from the E Shop when it does come out. The art style is great, and the dialogue is great too. The puzzles aren't that easy, but you feel great when you figure it out