Great graphics and audio, and interesting concept!
My only issue is that the game is sometimes unclear on it's rules.
For example, sensing a lie does a "negative" sound effect, and accepting their quest leads you to a dark character that turns your screen black. It took me a while to realize that my HP got reduced. I didn't really understand the connection between the dark character and my HP going down o_O
Also I wasn't sure when lying is successful or not. Sometimes when I lie it works and sometimes when I lie it doesn't work. I might have missed something but I didn't get it xD
Other than that, the game is great. Good work!