Nice game, I enjoyed that!
I don't quite understand how I only get 2 options: die to doppelganger during interrogation, or win saying it wasn't doppelganger at all. Also there's a long branch of dialogue about cookies, with no options, that makes suspect angry and kills you, it's like a dead end you can't save. It's alright for a jam game though, It's hard to playtest everything in a short time.
I like how simple game looks and plays and at the same time how deep you fall in the atmosphere and context it creates. I was actually afraid to annoy the suspect after just several lines of text. Great job!