I have 2 complete combine dairy, 2 dairy piece, surge and cabinet keys. I don't know where to use the keys for. I check everywhere it didn't automatically use on anything.
here's a short walkthrough, you'll need to do the following to progress in the game
- collect diary pieces and read all three diary entries
- trigger death cutscenes (mirror, box, drink, blood stain)
- find all clues (unlock corner cabinet, drink & house-plant, cleaning the bloodstain), then read the bulletin board
then the game will proceed to the finale.
good luck! you can do it ※\(^o^)/※