This. Game. Needs. Feedback.
I can't tell when I've hit an enemy, or when my wall jump timing is correct. I'm not sure where I'm supposed to be going necessarily, or when I've collected an item, or what the items do. I can't see my health, or my items, or my trident sometimes!
Damage boosting as movement tech is a cool idea, but if you do it you need to give the player a way to heal or you're just punishing them for backtracking. Which is (I think) required in this game.
Making the shrimps the enemies, and the NPCs was a little confusing too. I feel the whole experience would've benefited from just a little more direction for the player.
I can sort feel the love in it though. It seems like you've drawn the whole thing yourself, and I do like the world map when it works. The settings being a little iPod is a nice touch too, even if it's not implemented very well.
It's a good try.