These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The creepy appearance of the poor dudes in SQ4 with all that headgear could scare some people too.
The Body Horror caused by the Pukoid virus is V is as terrifying as it is Squicky. Pukoid Quirk in particular has a face that will give you horrible nightmares.
More Body Horror with Beatrice. Look at her in the cryochamber and leave. Repeat over and over. Squick!
That One Level: In Space Quest IV, the Skate-O-Rama scene where you have to escape the sequel police.
In Space Quest V, rescuing Cliffy with the EVA pod. Not only you need to locate him first, you must do it quickly before you run out of fuel and oxygen. And don't forget, you also need to return back to the Eureka!