Haha, maybe I chose the wrong wording. Don't get my wrong, I totally agree with you and I'm not arguing here, just thought I'd explain my reasoning here, in case you're interested.
By "overpowered" I didn't mean that you could kill the victim too quickly (as you say "winning" is not really a concept in the game). Rather it's overpowered because you could easily reduce the entire body to a pile of almost nothing in 1 or 2 second and a few easy clicks, which I though made it feel a bit unsatisfying .
And by "skill", my intention was not to add a challenge to the game at all (again not really a useful concept in this "game"), instead what I wanted was to firstly, make the sword more effort to use in order to slow it down, and secondly make it feel more "realistic" and satisfying to use.
It's definitely pretty janky to use right now, but I did find (in my opinion) that although it was very difficult moving the mouse correctly along the swords axis, knowing the mouse position wasn't that important, you just had to take a little time to line up the mouse and with very little practice it definitely got easier to use.
(Spacebar+F2 will select a debug tool. You can turn on the Tools Debug option, then with the sword selected turn on Drag to Cut if you're interested to see how it feels to to just be able to drag a line to make a cut.)