Are you having everyone play to see who gets the high score or you just want to take turns? If it's turns, just limit everyone to one quarter and don't give them access to the credit button. If that's the case then House of the Dead, Zombie Raid, Golly Ghost and Ghoul Panic should be OK. Ghoul Panic is essentially Point blank with a ghost theme.
As far as timed games, check out Sharpshooter. There is a "horror" themed section with several short games.
If you don't mind going old school, check out Triple Hunt. Configure it to the "Witch Hunt" option ( I think it was a dip switch). This is timed. Just get the overlay artwork and you should be good.
Edit:
Another timed one to try is Ghost Hunter: