Really cool game! I really enjoy the feel of it - especially in terms of spamming the dash move. I love me a good dash move, and knocking into walls is fun on its own right too. The items are very fun as well! Overall it's a great dungeon explorer type game.
I think in terms of theme it does fit (Being the sword, transforming into items, controlling the sword direction independent of the player character, etc) but I don't think the mechanics fully convey that. Don't get me wrong though- the mechanics are really good and feel good to engage with, I just don't think the "controlling movement with WASD and controlling the sword with the mouse" is a unique way of conveying "you are the weapon", because that's just basic twin stick shooter style gameplay.
However despite all that - it's a damn fine game that feels so good and juicy. I wanted to engage in all of the rooms, fight all of the enemies with the tools I had, and discover more of each and every room as I played. It was fun, fast paced, and combat was really satisfying. I'd love to eventually see more as it goes on. Congratulations on a job well done!!