This needs more levels!!! I like this puzzle game very much and I hope there will be some more levels after the jam.. especially after you hook someone :D
Well your game has everything a good puzzle game needs. The presentation is clean and clear. The concept is easy to understand and builds up slowly and get challenging but still fair.
One thing was not really clear though, that the grappling hook can be used with boxes, because they are wooden too. But maybe I'm just to tired and didn't paid enough attention.
This is a great game, which i would continue to play. Great job!