Not bad! I like the idea of a game where you have to defend while you charge a "super attack", but the problem is that the defending needs to be the fun part of the game. With how the game's AI was, a lot of the game it felt like it was just a very slow rhythm game, where I held left mouse and then clicked right to the "beat" of the attack, which wasn't super interesting. The dodge also was never really needed, and it was frustrating not knowing my health. It also wasn't intuitive that I needed to FULLY charge the crit bar to actually kill him.
Still, with a little better AI and some more interesting attacks to dodge/counter, this could be cool!