Thank you for your feedback!
I wanted to implement a radar system with dots telling you where to drop them off, I ran out of time.
And you found the bug that frustrated me the most. As far as I can tell every time you reenter a district all the collectibles you already got re-spawn. That code was working at first. At some point I fixed one thing and broke that.
I think eventually I'll post an updated version that fixes both. I'm not sure when.