[Tried to put this as a reply to my previous post, can't.]
Also, I have twice triggered a bug where I cannot move or otherwise choose any items after levelling up. This happens when I put my level up space somewhere such that some of the space is red (invalid.)
After that happens I cannot choose any more items, even in future rooms. (screenshots are deleted as they are making this harder to post, but I have screenshots etc available if desired.)