An interesting concept, Agatha Christie vibes, very cool!
I had to replay to get to the ending, and I liked that it is up to the player to decide who is guilty.
The only thing I would probably wish for is a bit more consistency. For example, the art palette could be limited, so that characters looked stylistically more alike. The world of the game could be more coherent: right now it is hard to understand how and why these characters exist in the same universe (even with the plot twist that we learn), where their motivations come from and what are the general rules of this universe are.
I would also say that it would be probably great to make the player use the scaling mechanic instead of implementing it into the narrative. Like it is we who investigate, not the game on its own :)