Difficult, buggy.
It's obvious you spent a lot of time polishing this game, but it's just too hard. Just the fourth level required intense precision, especially with the way the string moves so quickly. Human hands just can't move a mouse that precisely without jiggling it a bit. Beyond that, it seemed to have bugs that made it unplayable. I would just randomly die in a level, and I could see my string's tip wasn't anywhere NEAR a wall. All in all, this game was good for nothing more than a few minutes of frustration.