Pretty well and challenging demo. I really like how detailed and clean the pixel art vibe is. You can see in the intro cutscene how expressive the characters are which then translates to their sprites.
I only played it solo so there was a bigger challenge in beating the first stage since I kept dying to the boss until I got its pattern. Parrying felt a bit off at times but not completely, it might be something on my end. Other than that, no lag nor issues whatsoever with the length of the stage, the rate of enemies spawning or the overall movement.
Good job as of now, hopefully we get more of it not far in the future.