Saw it on Brainless's stream and had to try it. It is indeed, great, and especially impressive given that you did it all yourself.
Just a couple of nitpicky comments:
Keyboard controls didn't feel as good to me. It seems that gamepad would be a good match?
AT first, even with the helpful gif in the description, I was unsure about how to parry the bosses' attacks. It felt like I was putting myself in harm's way.