Cryptozookeeper (2011)

Marrow is delicious but that's not why you're here. You're supposed to pick up a single jar of alien bone jelly, which of course can't exist and doesn't exist, so you've convinced yourself that transporting it is no crime. Getting worked up about such nonsense would be like fretting about mermaids getting caught in tuna nets, and you've got other fur-bearing fish to fry. A piece of interactive fiction written by Robb Sherwin.