This is stellar, but you have to go in blind and be patient, observant, and methodical to make any real progress - expect to know nothing and understand nothing and leave with nothing but a sense of uneasiness even when you're done because...
...it's also a two-parter: you NEED the other related title in order to get the FULL experience and to make sense of the entire thing (check the creator's page for, "Basilisk - 2000"). I know the addendum isn't free, but it's NECESSARY for the full experience, I'm serious.
It'll be the best $3 you've ever spent, and you'll get 6-8 hours out of it if not more.