Agreed with these folks - beautiful game with some interesting and challenging controls. It would have been great to have a tutorial level of some kind to play around with and learn the controls a bit better.
I also found myself guessing at what I could or couldn't reach - some indication of where my grapple range was would have helped a lot!
However, these are pretty small qualms, the game was a wonderful experience! Especially with the great art and sound that set up your atmosphere. Great job!