This was a really cool game! I really enjoyed the pixel-y art style and music choices (especially in the credits), and the story always kept me guessing. I loved the relationship between the two main characters as well, the final scene in Ending D (which I interpret as the “true” ending) was really heartwarming :’)
One small thing though, whenever you try to progress through the game without completing certain objectives (e.g. if you don’t read the large book in the library a second time before going to the elevator, or if you don’t disable the controls in the CCTV room before the final confrontation) it allows you to go through the door and leads to a black screen with no way to progress further.