I was invested in 'Til Checkout Do Us Part' from the very beginning - from the dialogue and ambience, to the tip of the hat to films like Psycho, this demo has a lot going for it.
It will be interesting to see if Rachel's brother makes an appearance in the full game - and generally intrigued to find out more about Harold and Margaret. Will definitely be checking out the full release.
Only potential bug I saw in my playthrough was Margaret's face when we first see her - didn't know whether her face was meant to be blurred or not initially?