I had problems with the grappling, as well. It really only seemed to work when it wanted to, and when it did, it flung me into random directions with an absurd amount of force that render me unable to control the character (even left and right had no real effect at that point).
That being said, I really like the sound design of your game! The SFX and the music both really fit the game's aesthetic and adds to its experience. Overall, I feel like I got an idea of what your game was supposed to be and that it has a lot of potential. I think you just needed some more time to really get the controls set just right.