Beautiful game your pixel art and animation is very cool and an evolving character is a really good idea !
But I think your game miss checkpoint, I went to the giant enemies hardly and I don't know what to do so I'm dead and I didn't have the courage to do it all over again... :/
And second thing I think you put all the coins to show the "classic" path to take but there are useless and there's not even a counter so we don't really want to pick them up.
But I don't forget that it's a jam game made in a week so very good job ;)