i will say, this is quite a strong idea! however, if you do plan on continuing it, your going to need IMMACULATE level design. this type of game, with it being free roam and speedy in nature, will require for you to make some truly excellent levels - or else the entire thing will fall apart. Alternatively, you could severely weaken the grappling hook - its more of a "drag you to the place" than a "swing like a rope" hook right now. maybe make it so it functions like a rope - with the hook not pulling you in when its a certain amount of rope left