The theme usage is great, and the game is enjoyable to play - but mainly because of its creativity and aesthetic.
You're not rewarded for being able to cure people quickly, or punished for giving the wrong cure - so I didn't feel compelled to keep playing.
The game does feel very polished! Except for the recipe menu not closing unless you move your mouse below (not above) it (which took me a while to figure out)
(I also did a rating)