As for the gameplay I think it would be a lot more intuitive and easier to play if the rope would not stay by default and then be removed with another click but instead stay as long as the player holds the mouse button and is then removed on release.
Also a jump function on the space bar might be nice. It might break some levels but that in my opinion is a fair trade for better controls.
I have to admit, I lost interest once I reached level 08.
Probably because of the controls - They don't allow for fast-paced movement.
Or maybe that's just my short attention span.