Even after I got used to the grappling hook mechanic, I replayed it many times just to get all of the endings. Good stuff. If you want to make the gameplay easier but maybe more fun for some people, you can add a crosshair, clicking with which on a box causes the grappling hook line to point exactly to it. Also, there's one problem with the movement - while walking, it feels like you're walking on ice. It needs more deceleration/friction.