really cool mechanic... It took me a while for it to click but it works well, I'd love to see a more complete game based on it, as I think you have the start of something that will be lots of fun if you put a bigger game behind it, possibly more of a puzzle game than Metroidvania, though again maybe that is because of the smaller size.
Not a massive fan of the AI art... I mean it looks good, but I would far prefer to see rushed programmer art than AI generated artwork, maybe I am marking the sensory score a little harshly because of it (sorry) but having read the other comments please don't let that equate to the music your daughter did, because that is a really nice job!
All in all a really nice entry that could be the start of something great.