I liked this game a lot! I really have no idea why it isn't popular. At first, I was annoyed by how you could only charge your sword at one side. The jumping on heads was way more cool. I don't even think the sword ever works on the boss. It was genius to have skulls appear.
They are what heads are without flesh, obviously. The sounds were quite nice. At least I'm around to praise it. The hitting noises were so nice, too. It was just really satisfying.