I know. I saw. It was a great video all around and a great nostalgia trip. I'd still argue that Catacombs, with the exception of different guns, was really the first game that had all of the elements of the 3d shooter in place.
Shareware was the original micro-transaction/dlc model and it was amazing. these kids will never know the joy of getting an envelope with 3.5" floppies and a hand-written receipt from a software company.