Really fun. I finished in 4m 50s. Some of the swinging felt a little bit weird, especially in tight spaces. It was like the swing was still occurring but I was pressed against the wall, instead of resetting my momentum when I collided. But that was minor, other than this the mechanic felt really good, and I like that you could grapple to enemies.
A tutorial level is always a +++ for me, so well done there. Overall, a solid little jam game. Also, using a hook sprite gets you bonus points!