Interesting concept but poorly executed. The bosses are too easy and since I didn't figure out how skill work I defeated all of them except the last with just basic form. Kind of defeats the purpose of having skills if the bosses can be defeated with basic form. The flash boss is bugged and doesn't turn if you jump down too far from him, making him easy. Only the last boss works properly and requires player to understand and use the skill system, I defeated him using flight.