Thanks for playing! An update is coming soon (in a few weeks, maybe?) to add a bit more content/ways to play so I hope you stick around for that.
Ah that's a good callout. It's a 'bug' in the sense that I didn't think of the scenario. I'll have to add some code to check for this, essentially the fireflies turn into another enemy entry, so you're stuck with the old one that no longer exists in the dungeon. Ideally this shouldn't happen, but technically 'working as intended' haha. I'll make a note for myself, thanks. This probably happens with Bounty Board as well.
And thanks for the achievement typos -- dangerous of copy-pasting data!