Speaking of horror and horror games I have published an original horror game involving zombies, mad scientists and Things Man Was Not Meant To Know. If you have any interest in those kinds of things, or Rogue-likes, check it out.
Dead By Zombie:
There's a free demo for the Mac. If you like the demo, you can also buy a license to upgrade to a Premium version with more game play and a larger world.
Mmmmmm, tasty brains....
Principle Mad Scientist
Any given program will expand to fill available memory.