@Sashpuri
The ammonia in the window cleaner mixed with the bleach causes a chemical reaction which results in mustard gas, a very toxic fume which was originally used as a weapon in WWI. Easy mistake to make in a home, hence why it would look like an "accident".
BUG: I became stuck on the scene with the bell, where the demon left but the camera stayed at that scene. I believe this was caused by me entering the room and then quickly leaving.
That was so easy, and the "puppy" is an obvious gimmick to hold the attention of the cutsey-loving crowd, which does not make up for the extreme repetitiveness and ease of the puzzles. 2/5