I made a grappling game too! I really like this version of grappling hook mechanics. The art is nice, and the sound is pretty good. I would've liked some action music in the background though. My main critique is that a lot of the time it feels like I'm jumping blindly and hoping I'm going to land on something just out of frame, or else jumping blindly knowing that something is out of frame from a previous playthrough. I think adding the ability to descend with the grappling hook(similar to how you have the ascend with right mouse ability.) There would of course be a limit since the grappling hook's rope can only be so long. That's my only big suggestion. Great job overall :)