Really cool game, with a really neat concept! Felt like you did a pretty decent job at putting the sword mechanic through its paces with some cool bosses to fight against: just wish there was even more bosses and obstacles to fight against as I was just starting to get so stylish when it was all over! I was expecting the sword throw to be able to be controlled with the mouse for more precision, but the keyboard controls still worked alright.
Having said that, I did encounter a lot of issues. First, I was totally lost on the initial level with no way to proceed as I had no idea I had to kill everything to open up the way: I figured it out eventually and maybe I'm just dumb, but maybe some more direction, or some sort of kill counter on the door would help to guide. Second, there were a lot of times where the sword worked against me, like getting stuck in a wall or ground that's right next to me despite me throwing it away from it, or getting stuck in an unreachable spot to reclaim it, leading me to have to just kill myself to restart (maybe there should be a way to recall the sword to you that takes time to do as a last resort?) Finally, the game did seem a bit glitchy at times, with physics and animations just wonking out in weird ways, enemies getting stuck in the air and such, and some crashes.
Despite those complaints and frustrations above that I experienced, the game was charming and fun enough that I stuck with it and enjoyed it a whole bunch in the end, so kudos!