Very clever game, though as is common with detective games it’s fairly easy to make wild guesses based on half-baked assumptions.
If by any chance someone is reading this comment before they actually play the game: For every demon there’s a definitive way to determine their identity, you will know it when you find it.
I thought the art was pretty neat, the Wigglypaint style is a cool way of giving the demons a slight “otherworldly” vibe in a strangely adorable way. I was expecting the designs of the demons themselves to be more important to determining their identity, though.