I may be giving higher praise than it deserves, but I had a fun time playing the game. everything up until the castle was basically tutorial. the castle was the most fun and difficult part of the game. the soundtrack felt perfect and the dungeons were fun.
I don't know why people are complaining about this game being too hard and frustrating.The enemies were all pretty easy except for the marshmallows. games need to have penalties in order to motivate you to not die, and this game is obviously emulating zelda. I died a few times too, but the game gives you plenty of chances to collect hearts, just be careful not to lose any. a frustrating game makes the finish so much more satisfying in my opinion.
my one complaint is that the soul you were protecting wasn't really present during the game up until the end. you didn't have a weird aura, or a ball of light hovering over your shoulder, you didn't get a special attack for the soul. I would at least have liked to have seen it once, even at the death screen or something.
in summary, it is a good short game worth playing through.