i was about to say "I wish while you are grapling a object, you can swing beneath the screen instead of dying" but then I realise, that's for anti-cheat (i was angry because I tried to break the game instead of playing it the correct way :p)
The only things I would like to mention is the speeding the charather can be quite OP (though, if you don't remove it that's okay too, because I like going FAST) . Also, the grapple only grapple to the things to the right and not the closest thing. (I know you need to go forward but it's better if it's the closest object because in certain scenarios it need to be the closest object so just make it the closest object. I would also like a crosshair to be placed on a object that will be grappled on)
Also, I finished the game! Had loads of fun.