Very nice! The lighting and the sound design really gave the game some good polish. I liked the spin animation on the sword, too. That was a pretty quick and effective way of providing impact.
I'm not sure if this was the challenge you were going for, but I found that there was no real indication that the other character was being attacked (or in danger) when I was controlling the other. This made me feel like I had to keep both characters close to each other, since my eyes would be the only indicator, which I think makes the separation of duties feel more like a limitation than an opportunity. Maybe there is something you can explore there!