I found this to be a bit tough to get the right timing on. I saw mention it was rhythm-based, but I just couldn't feel the rhythm matching the flow of the movements. Initially I couldn't hit anything, always swinging a bit early or too late. Eventually started to get it. My best was 61, with a streak of 11.
It would be nice to have a bit more explanation on the mechanics to start, though in playing they did become clear. I thought the bar above your head was your health, but it seems to be more of an energy bar, and you die from one hit. Using abilities uses energy, but hitting the enemies recovers more energy. There also seems to be a delay before you can act if you run out of energy. It would also be nice if you could fully skip the intro text. The page says left click to skip through dialog, but that seems to not work or only minimally speed it up.
The art is good and clear for being limited in colors. The music fits the pace of the game, even if I didn't feel the beat matching the movement. The game is challenging, but for those that like this style it is probably the right level of difficulty.