Not bad
The game is simplistic, the controls are decent. My only complaint is the way scares are detected. It seems that detection is based purely on visuals, since it is possible under certain circumstances to have one person standing directly in front of a scare and not notice it because they are facing the other way. Perhaps noise could come into the equation?
Also, a relatively easy way to scare multiple partiers out is to build up the 'scare meter' until it is high enough for you to use the second scare effect of the mirror above the fireplace (the lightningbolt effect), which has high enough scare value for its speed to scare anyone out of the house if you spam the down or up buttons when they enter the room. I've got an average of twenty people out with that tactic alone.