One Night 4 was approved for release on Desura yesterday, and should be available some time next week. The full game won't be arriving until much later in the year, but an in-development Alpha version of the game is available which features the entire first area. This build was created to showcase elements of the game to backers who supported the Indiegogo campaign, and will give you a good idea of what to expect from the full game.
Currently, I am uploading the required installation files to Desura's servers, and they'll need to be approved by a staff member before they're available to the public, but this shouldn't take too long.
More horror to come!