A bit to the upper right of the room with the second save point is a room where one door has a lot of barrels forming a staircase to it. If you jump, air-dash to the right, and then use the up+sword special attack and you can reach a hanging ball and chain. From there you can get through a hole in the ceiling. There is probably a better way to the area past there, but that's how I did it.
It's seems like that you guys can't go through the map anymore, right?
Well then, I'll guide you guys the walkthrough, 'cause I've played it for a long time.
that would be very helpful, thank you
save point