I enjoyed it inmensely. It hasn't the depth or scope of games like System Shock 2, in fact it's a short game once you know exactly what to do, there's even an achievement if you can complete the game in less than 10 minutes, but if you are a completionist or you want to read each and every note and email, hear all the audiologs in order to know the story and explore the ship in its entirety it'll take a few hours.

Back in the day I was a fan of a relatively obscure C64 game called Project Firestart and Spirits of Xanadu gave me strong vibes of it more than a few times, that's one of the reasons I liked it so much, although in this case its spook factor has a different origin, in a way it's more interesting.