I got 208! (How'd I do?) Really neat idea, and a fun game. I got the hang of the hook eventually, I think what made it difficult to use was that I couldn't always adjust the length of the rope (I can't tell why though), and there were lots of time where I would grapple the ceiling, but then land on the floor and I struggled to get myself off the ground.
When the level started looping it was actually kind of fun to go through it again, but this time taking new routes, or mastering old ones! The music was fun too! A game based on moving about solely using a grappling hook is a great idea, and I would love to play more games that do that. Good job!