Hia, I found a bug by accident. You can clip into this ceiling right here, at the beginning of the final part in the king area. I was just getting the extra life when it happened. It seems like it's not hard to pull off.
yeah, it's not a soft lock, just a little bug. I didn't try, but I think you can go into the ceiling further. That might result in getting stuck, but that's not easy to do.