Really cool premise! I like how varied each of the enemies looked and the way attack sounds sound like chess pieces rattling around on a board. The attack animations also have a great deal of variety and I like how you implemented them. The platforming creates some interesting challenge and the generation keeps it fresh. I could definitely see this being expanded into a whole roguelike! One comment though, because there's fall damage and the gaps between platforms is hard to judge from the camera angle, platforming is a bit rough and I definitely lost a lot of health because of that.