Very cool-looking game with awesome animations and a nice little cutscene!
I think you should consider having 2 separate coordinate systems, one for in-game position and one for the screen(or just keep it in mind and then recalculate for screen from the height) because the enemies follow you based on your position on the screen, not on the position in the game, so not only it confused the AI's pathing, it also made them go up the wall!
I would definitely speed up the slicing animation, it feels kind of disconnected because it's slow but the slash lands quickly, if im not mistaken it takes over a second for the slicing animation! It can be hard to figure out the distance too.
Other than that it was a cool game and quite polished visually as well. It was a bit limited on health, but i managed to beat the boss on the third try!