The blocking and parriyng mechanics feels great. As for the game (I know this is a prototype, but in a jam one has to evaluate it as a game as well), I can't say I didn't had fun, thanks to parrying mechanics feeling good, but the challenge was clearly missing, the difficulty is increasing too slowly to make effect.
Maybe you could simplify by removing the vertical look axis as it serves no purpose, and I play first person games with invertY so the vertical axis was just unneeded disorientation.