If you look ate the mirror after only eating the melon your trapped with no way out this happens again if you look in the mirror after eating from the cave.
What do you mean?
There's no in game way to leave the mirror if you do any of the things I stated, you have to back out with the save bar back arrow.
There is always a "back" button at the bottom.
Found it just had to set my zoom to 80% to even see it.