Sepulchre horror adventure available for free and as special edition
The $3 special edition includes the game, the original soundtrack, two wallpapers, and writer Ashton Raze's e-book Bright Lights and Glass Houses.
Sepulchre takes about a half-hour to play, so it's nice and short. You could always try it for free and pay the $3 if you enjoy it.
Owl Cave noted that the original build contains a weird technical bug — co-founder Lewis Denby forgot to turn off the dev keyboard shortcuts — but new builds are available that fix the problem. There's also an easy workaround: just avoid pressing anything except the "escape" button.