YMMV / The Turing Test

• Big-Lipped Alligator Moment: The secret room in chamber C26 has a computer that, when activated, triggers a short segment of virtual reality with stairs and balconies floating in a void. It seems to be a Shout-Out to the game Pneuma: Breath of Life, made by the same developers, but it just seems out of place in the context of this game.
• Jerkass Woobie: TOM. While he's supremely arrogant and dismissive of human intelligence and reasoning, to the point of considering mind-controlling humans to be doing them a favour, and feeling perfectly justified in imprisoning the crew on Europa for the rest of their lives or killing them rather than letting them escape, it's easy to feel sorry for him during either of the endings. Either he ends up killing someone he regarded as a friend, leaving him shocked and seemingly unable to believe that she's really dead, or he can't bring himself to kill her, and she kills him instead, even as he pleads with her that he's not ready to die. Either way, and regardless of whether you agree with his reasoning, it's clear that the combination of his programming and events on Europa have put him in a situation where he feels that he has no good choices.
• Nightmare Fuel: You find a computer with a Turing Test on it, where you can try to convince it you aren't a machine. The words you type make it very clear that you are. And that you are trapped.
• Scrappy Mechanic: One common complaint is that the audio logs are muffled and are difficult to understand, with the additional hindrance that they have no subtitles. The developers have stated that it was an artistic decision, with the idea being that you are eavesdropping on conversations, so it is a deliberate challenge to hear them. Unfortunately, with the only available language being English, it pretty much locks out that content for non-English speakers as well as people with hearing or auditory-processing impairments. A trancript of the audio logs can be found here.
• Special Effects Failure: Most photographs featuring crew members look very obviously photoshopped.
• That One Puzzle: The very last room before the epilogue is insanely involved, not least of all because unlike just about every single previous puzzle, you're not actually supposed to use all the components in the room - some of them are just there to distract you from the real solution.
• Too Bleak, Stopped Caring: All the game's characters eventually turn out to be so unlikeable that no matter how the game ends, it's hard to care about any of their fates. Let the humans shut down TOM and carry the virus to Earth, potentially throwing the whole biosphere into irreparable chaos, or gun down Ava and Sarah and condemn the surviving crew members to a Fate Worse than Death. Either way, they got what they had coming.
• The Un-Twist: Players expected one of two things to happen: either it was revealed that Ava herself was a robot, or TOM became antagonistic in the style of HAL 9000. The latter happens.