Looks like there's another Italian around here...
I was honestly not expecting that much from this series, but oh boy was I wrong!
The premise is definitely interesting. Watching the small bits of how the world works is always enjoyable.
The game itself has solid gameplay, nice characters, funny dialogue, great art and SFX. It's also really challenging.
It has a few bugs, like the "One out of Two" medal (I have tried to fail only one of the deductions, but it really doesn't want to give it to me), or that old Firefox thing.
I absolutely love the way you portrayed the action in this game, and the way you get tips is nice too (Usually, I'd see the smart detective guy asking the dumb assistant for tips). Already played the Nine Deaths Cat, can't wait to play Death after death and Walls can bleed!
The only thing negative remark I have is the extremely tedious process of double-checking the evidence you found for each possible informer. I don't know if this is already a thing, but maybe you could add an option to mark certain evidence as NEW, or IMPORTANT?
Overall, this is a great game, and I can't wait to see what you can come up with.