Very cute game! I didn't manage to figure out how to submit the created potions... I mixed all of them and put them on the tables but the counter didn't go down. Putting them in the recycling bin didn't do it neither ^^ Maybe add some arrows when you're holding a correct potion so the player knows where to put it.
Also I think it would help the graphics a lot to enable anti-aliasing and maybe some shading (either baked, runtime or SSAO, but that only works on better graphics cards). Also some height fog could be nice :)