It's pretty amazing that you managed to put all this together in such a short time.
I did not finish this -
That said, the main mechanic - the lantern - feels great. If you have never played Unbound or Guacamelee - you would prolly like them.
As a prototype, I think this is fine. As an entry into this Game Jam, i think this is Phenomenal. After reading your "Design Document" I'd say you pretty much nailed what you set out to do.
What I get from your prototype is a game that wants to:
Look like Animal Well
Play like Celete / Super Meatboy
But have the experience of a Metroid game.
That's what the Game Design Document is for. Those are three different games, all of which have similar elements, but each of which is it's own unique experience.