I love the atmosphere in this one, that combined with the simple objective of shooting at viruses which forces the player to think about their actions is the perfect formula for a great horror game. To put it simply when a player is forced to consider things in order to progress through a simple objective (keeping track of the maze, spotting viruses, listening for sounds, etc.) they might lump the slight fear from the creepy environment in with the things that actually influence the objective. This causes them to see danger where there is none - exactly what every horror game wants to accomplish.
As for the camera: i really like that you have a freely rotating one instead of the same kind that almost all games use - so many games that feature cave exploring get this wrong (cough-cough-subnautica). Y-inverting the camera movement was definately a mistake tho, that tripped me up the entire time i was playing.
Overall, good game for 6 hours.