Nice one! It is really cool that you can actually play the stories of the suspects to guess who is lying, makes the game a lot more interesting to me then a generic detective story.
The art was very cool and unique and the character design was interesting, I especially liked the stoned guy with the katana.
As you already said, the gameplay needs to be polished a lot, as well as the UI. The level with the aliens was frickin hard compared to the other two.
The music had some really nice ideas in it and managed to capture the atmosphere but I think that the arrangement was a little bit odd, sound fx were ok.
Ovarall I had fun and I found the game interesting in its mechanics, good job!!