Thanks for writing! It's true that the grappling UI needs improving so that the player knows that they are aiming at all times. I think it could be shrunk or made more transparent while a target is not currently being aimed at, so that there is also a way to communicate to the player that they are currently aiming at a grapple point and that they can now grapple to it. I'll look into improving that. Auto-target or a target lock-on would also be nice features to help make grappling around easier.
Thanks for the review and for the ideas!