Cool looking game, especially the Boss looks very unique and is quite nice animated. The spinning part / mechanic is quite interesting but I had trouble understanding it at first. Also it was sometimes hard to time a Jump to evade the ground attacks. I would have liked a range attack in addition to the melee part as one is forced to move in and out of the boss, which might be your intention but at close range it is hard to evade anything - but I guess that’s a skill issue ;)
Anyways, cool looking game and fun. A Job well done!