The generally agreed upon distinction between horror and terror is that terror comes first. Terror is that uncomfortable feeling of anticipation when you know something bad is about to happen. Horror is the shock and disgust that comes from encountering the bad thing.
Stasis certainly looks like a point-and-click horror game, especially with its judicious use of gore and other horrifying imagery, but these images aren’t just there to shock us. They’re also there to terrorize us, to build that dreaded anticipation of something bad being just around the corner. The greatest trick that Stasis pulls on the player is making us think we’re in danger. We’re constantly waiting for the proverbial “monsters” to appear, the ones that have destroyed this science lab, that seem to stalk us through the corridors, but it keeps putting off this encounter to show us their handiwork instead. As a result, all those scenes of horror become representative of something even worse, something terrifying.