The clue in “Dalby is Dead” is in the title. Dalby is dead, and they’re coming for you next, so you’d better get rid of any incriminating evidence. I love that you start the game by first defining your relationship to Dalby, and you can choose to be incriminating or not.
What’s ingenious about this game is how it uses a Big Switch to toggle between obvious and hidden information. How your understanding of a scene can totally flip on its head when you press it. What a wonderful little puzzle box!