The basic premise of Observation is certainly original: rather than controlling the protagonist (a female astronaut), you have to help her as a disembodied A.I. (called SAM) by manipulating various space station controls after something has clearly gone very wrong. Imagine being H.A.L. from Kubrick's classic 2001: A Space Odyssey.
The story and creepy atmosphere is what will likely keep you engaged, given the gameplay is fairly straight-forward (there is no combat or anything) and the controls are frnakly exasperating. If you're going for mouse and keyboard, you have to somehow use WASD (to move a camera), arrows (to zoom), and the mouse (for cursor control/interaction) at the same time. Inexplicably, you can't rebind to the numeric keypad, which would have made all this somewhat more intuitive. I ended up playing with an XBOX controller, which worked more naturally, although it all still felt extremely cumbersome - especially controlling the sphere through the zero gravity environments.
Further, imo the game often didn't properly explain what you were supposed to do next or where, so I ended up just randomly exploring the station clicking on things and going through menus hoping to stumble upon the whatever the game wanted from me. The "puzzles" were generally fairly straight forward, although a few were a bit obtuse (again solved mostly by trial and error rather than using your intelligence). Not exactly fun.
Overall, if you can get past frankly terrible controls, and enjoy linear story focused thrillers, Observation is worth checking out - but you possibly won't really "enjoy" much of the actual gameplay.