Its HL1 horror mod... and one of the bestest imho. Director's Cut version realy enchanced in maps/models/story/etc - so, if you enjoyed old "Afraid of monsters"(like me gigi) - its take you soul again ^_^.
Site: http://afraidofmonstersdc.moddb.com/
P.S. Try to play on "Hard" skill - looks like it possible, couse i already in the middle of the game and alive (but my health most time in "1-25 hp" ).