First off, love your sprites. they town, the characters, all looks amazing.
I'm not 100% sure what the premise is - I think you have to figure out which monsters are secretly humans in disguise. I got one once but the rest of the time I kept murdering poor innocent monsters. I like the concept - it's kinda like a cross between Werewolf/Secret Hitler etc and a 'Spot the Difference' game. I do feel like the axes for suspects could be a bit more obvious - maybe a white line around them to brighten them up.
The music is also a great blend of catchy without being annoying.