Hey really cool idea! I like the whole concept of trying to play as the sword. Interesting to have the ability to go against what the hero wants to do. I did finish it and got to level 5 (it would have been cool to have the reverse that shown continue with more levels! Maybe in the next instalment) though it didn't seem like I was at much risk at making the hero mad. I was mostly using lifesteal since that was a good combo of health but also dealing damage.
Again good idea, and I know with a game jam we can't get everything in! I think just a few extra things would help the feel. Most noticeable might be the lack of sounds, I personally think some very basic sounds or music or ambience would have added quite a bit. Also felt like I was fighting the same guy over and over again!\. But these are minor points and I'm sure if you had more time stuff like this would have been added in.
Overall though very cool take on the theme and interesting game! Good work!!