The grappling hooks are really fun. I enjoyed the simple graphics and it was pretty difficult to complete all the levels since the movement feels kinda stiff and momentum doesn't really work. But it was still fun nonetheless.
I think adding more sounds just to make it less repetitive and some background music would be very nice. Camera shake and particles would be ideal as well to make the game feel better. But considering you only had a week, this was very well done, great job!