Loved it! The visuals and sound effects were great and makes actions impactful. I was also a fan of the visuals being pixel perfect. The controls are really great, the only complaint is that I think you should be able to jump after an attack faster and I felt jumping on "up" wasn't super comfortable at first. Maybe you could've added a dodge or sidestep button to spice up the fighting.
Except for a small nitpicks you really did a great job!