Very cool game, didn't expect to go from party to satanic demon killing in one second :D mabye the transition between the two could be break up in multiple stages. First you see some tentakles then slowly everybody is going demon mode.
Also I didn't figure out what to do besides killing the demons, so after a while I just stop playing.
What made me thinking is, if this is only a drug.. do I kill people there ;O mabye this could be implied at the game. Where you can run away or dodge the demons or kill them, but when you kill them you killed a normal person that was just dancing.
Keep up the good work :)