So first of all, great game! I saw you were a bunch working on it! and that's cool! great job guys!
So about the art, i have nothing to say except : wow! Great pixel art! The color palette is cool, characters are fun. Great job.
About the sound, it's kinda sad that there is no sound when we click on something. But the main menu song is cool. Adding a click sound will be a good idea I think.
Then, about the gameplay, it's a cool detective game. I failed three time before winning xD. That's a pretty cool game guys!