All time lowest price for this game according to ITAD.
Personally, I would invest the extra 2 cents and buy from GOG because (a) I prefer their business model, and (b) you get the game DRM free.
From the website:
Observation is a sci-fi thriller uncovering what happened to Dr. Emma Fisher, and the crew of her mission, through the lens of the station’s artificial intelligence S.A.M. Players assume the role of S.A.M. by operating the station’s control systems, cameras, and tools to assist Emma in discovering what is happening to the station, the vanished crew, and S.A.M. himself.
You're not on the station, you are the station
Blending narrative adventure, puzzles, exploration, and cosmic existential horror, uncover the true nature of yourself, your crew, and the mysterious always-present hexagon on Saturn…
Enjoy!
Who says you don't get the game DRM free on Steam?