Lovely little game. The best thing about it is the tight controls, and fluid motions. I enjoyed it as the combat is fast-paced.
Though, I understand the game was supposed to be hard, but I think better enemy telegraphs would make the boss a little less unpredictable. For example, I can't really tell the difference between a pull attack and a normal chain attack, and that leaves very little room for reaction, because you'd need to react halfway through the animation.
Overall, very solid game, much like an old Megaman boss fight, only the boss is on steroids and hit way faster haha. A job well done! congrats!