Thank you for the bug report! We have squashed a few bugs with keys left on the stairs. Whenever I see that, I’m concerned something is wrong. The pixies absolutely should take the keys down the stairs. Sometimes, it can just be perfect timing of a hit that kills them a frame before they descend… but if that were the case, you’d see a health potion there too. Sounds more like a bug the more I think about it. We’re going to look into it.