Very interesting take on the 'joined worlds' kind of mechanic for the theme. Was interesting to figure out the puzzles and the best way of picking up gems quickly, and your level design to make use of the mechanic was good! If I had to suggest one thing it would be to add some sort of transition for switching between the two worlds, as it was a bit jarring suddenly just snapping to the other view. But other than that, really good job! :)