You have Blue Pixels on the Playersprite when showing the Screens for the first Time.
You are missing Walls on the Visuals of the Pathways between Rooms.
I played until the Screens, seems to be the End of the Demo?
I don't know what's supposed to be a murder Mystery in this, it feels more like a VN with walking, there's not really anything interesting going on. Some of the Dialogue is alright to read, but that's about it.
Art is simple but alright, as long as you can see important Set Pieces later on, assuming there are some. If there are none, why have the walking and Stuff instead of just a VN style with the different Rooms to cycle between?
Not too fond of the Story myself if you can call it that, so far it has just been introducing the People and then it ended for me.
Maybe it becomes interesting later on, it wasn't a slog to read through or boring or anything, there just hasn't happened anything to talk about really.