There is nothing so horrifying to me as the concept of a submarine, so this game already ticks the horror box for me on that basis alone. Congratulations on making a game that perfectly encapsulates why submarines are miniature circles of hell floating around where no person should be!
My fears aside, this a great game with creative mechanics. The use of tearing and tape is a fun mechanic that works really well with the destructive nature of the narrative. I kept on getting distracted from the text by how good the document design is; it helps make the game feel immersive (ha) from page one. I like your Macrophage Module and the events you created. The game is overall really cohesive, nothing feels out of place or like it doesn't belong in this game. Well done on making something that has made me squirm (in a good way) just reading it!