I love the graphics and I'm really impressed by how quick you've done this, still I'd like to give a feedback: Binding controls to the 'z' key is never wise, because in europe Y and z are switched, just use space to jump..?
in general this game would be lot more fun if I could use mouse and click to throw the anker.
I couldnt get past the first set of thorns because I always die there, maybe giving the player some HP instead of dying right away? That's why I would never play Super Mario Land again.. bad memories ;-)