I will just echo some earlier comments about finding it difficult on how the attacking worked. Being able to move while the attack animation played at the same time felt floaty to me, and without any visual or audio cues, I was never really sure whether I hit an enemy or not. Along with cues, I think just a slightly more easy ramp up would help get the player situated with the UI and controls before the real waves start coming in. This might just be me being a bad gamer, but I also just found it tough to know where I should be focusing my attacks.
I think the base designs of player vs enemy work well, and would encourage exploring some visual language/color palettes to help differentiate between the characters. As it is now, the player character and enemies both have similar palettes and blend in to the equally lighter/blue background. I think you have the start of this already (such as the red eyes on the enemies), they just have to stand out more! I really liked the music for this one, it reminded me of a mid-2000s action game that I'm nostalgic for.