Simple, challenging, and addictive! I genuinely believe you could polish this gem into something marketable if you choose to continue working on it. I want to talk at some length about why this game has good risk/reward design, which can help hook players.
Basically, you could just play it safe and continuously throw the sword at anyone that approaches, but the way the scoring is designed, you will get far more points by adopting the riskier strategy of letting enemies accumulate and skewering them all at once. Doing that requires a handful of skills, but only a handful: Navigating through the crowd without getting hit, knowing when to throw the sword at any enemies that will trap you, knowing when to use the invincible dash to flee, and skewering as many enemies in one shot as possible. There aren't too many things to get good at, but the game really challenges you on this focused skillset. As a result, there is a learning curve, but it is an approachable one! I think that's important for hooking players that just decided to try the game out for the first time.