Cool gameplay, and the art is great! Really nice job.
I wish enemies had less of an invincibility frame after being hit. It felt like I had to hit them... Wait a few beats... Hit them again... I think it would be snappier if you could be more slash slashy and then just have more of an emphasis on the dodging.
I think there should be a checkpoint during the last level after you fall into the basement area. I died in the last fight and it was a bummer having to go from the start of the sand palace again.
Looks like other people have said this, but I want to echo the camera edge of the screen annoyance. It definitely felt like it needed to scroll a lot earlier. I have a feeling it was trying too hard to keep the other NPC character in view, maybe it needs to give more precedence to the main character. Also the NPC seemed to get stuck a lot and stop me from moving foward. Happened to me a few times and I had to walk back to him for him to unstick.
The music is amazing, really bright. Video game music is tricky, though, because the looping is important. There were a few tracks where the loop was really abrupt.
Awesome job! Loved it overall!