Very cool physics idea! I like the paper mario style to the character when he turns. Love the squash and stretch of the jumps. Physics for the swinging felt really nice, but the ground felt a bit slippery. Maybe just a tad bit more friction would have prevented some of my falls. I also found myself wanting to let go of the grapple when I let go of the mouse, so I'd miss some of the jumps forgetting to press spacebar again. Really like the feeling of the swinging tho. Nice job overall!