Awesome game! Love the style of it. Very clever concept.
Few things to consider for changes is to add in some ambient noises/music in the background. Also some good visual feedback for when the player picks up a gem would help. Also would clean up some of the layout in the tutorial screen. Just make sure all of your text is neat to give it a good polish.
Fantastic work! I think that this has a good shot at winning in certain categories.