I had a lot of trouble with the combat for this one. I eventually figure out how it works due to a comment on this page. My recommendation would be to let the player learn the controls for combat outside of an arena (or at least not one shot you). Furthermore, not being able to press an opposite key to trigger an attack makes it seem unresponsive. I get that you can't pick your arc that way, but I'd almost prefer a random arc to the opposite side than nothing.
I ended up getting like 20-30 corpses sitting there (which is pretty cool to be fair) before figuring out the combat and being able to clear a few rooms. I really like the idea of your corpses remaining on the field. I love the animation to get your sword out as well as a bunch of the other animations. I imagine you use IK here for a few things ? It works well !
Lots of cool ideas and I'd like to play more, but some of the enemy rooms were too challenging for me and I could not make it further unfortunately.
Very neat concept and good presentation though. Lots of little details in here + UI integrated into the world/character is something I really appreciate.