Agreed, I'm just astonished how they got the feeling of exploration/intrigue/investigation in the game down so well.

I'm taking notes on how best to bring that kind of suspense into my sessions. I've had players feel similarly suspenseful using Foundry Virtual Tabletop and a fog of war on a map I created, but it's a little harder to accomplish that in person.

The improvisation is one thing and GMs definitely lend tabletop to be more creative in that way, but the suspense of not knowing what's around the corner or behind the door is harder to relay with just description. I think the visual aspect is definitely helpful.