I have a suggestion for a game, or rather a series of games, for featuring on the Game Dungeon: The Chzo Mythos series by Ben "Yahtzee" Croshaw. They are a point-and-click, pixel based horror series dating back to the mid 2000s, I believe. Great atmosphere, slasher-meets-Lovecraftian horror. They are available free for download:
http://www.fullyramblomatic.com/games.htm
In Order
5 Days a Stranger 7 Days a Skeptic Trilby's Notes 6 Days a Sacrifice