I accidentally started the same stage several times by accident, but other than that this game is very well made. The UI and overall scenarios are adorable and gorgeus, the characters are very enjoyable and the sound effects great (especially when the fairy moves around or the underwater effects)
If this gets mobile support, I can think of several people who would love to give it a try. The levels are not too difficult, but it's the first world of a demo so that's perfectly ok. The boss and the way in which it's defeated is GREAT, one of the things I liked the most.
Overall this feels like it's ready to go . One of my favorite games among all the demos. Good job!