Thank you very much for the detailed review.
It is definitely a bug you encountered getting infinite ammo. My guess is the gameObject hit a null ref when it was disappearing, and you were able to keep collecting. I'm planning on expanding the content, and hiding different fun collectibles in different scenarios, which will have to be gathered by 'farming' save files with different stats on them. I don't know if that makes sense, but you are very gracious to comment kindly on the metafab integration! Cheers and best of luck!