I don't know; I feel like I've been everywhere I can with the double jump. I found something that "looks like something belongs here" but I apparently don't have the something. Here is my map of explored locations: https://www.qtgraphics.com/files/Screenshot(1).png
P.S. Not a big deal to me but I'll add to the cursor bug. In some rooms, if I open the map the cursor moves at a literal snails pace but go into the next room and it's normal again. It depends where you are when you open the map.