I have just booted up Half-Line Miami [official site] – a mashup of Hotline Miami and Half-Life as created by student Thomas Kole.
As someone who has never really played Half-Life 2 or Hotline Miami (I did about one level of Hotline Miami at a demo booth one time and apparently own it on this here PC – who knew? As for the Half-Life games, I played the original until a bit where you have to climb into a ceiling vent which you reach by dragging a box over. I’d killed something directly below the vent and their corpse became an immovable object so I couldn’t put the box in the right place to climb up. After trying all the solutions I could think of I gave up rather than restart at my last save which was ages away. I tried the second game as part of the Orange Box on XBox 360 and got as far as Water Hazard.) I feel well placed to explain Half-Line Miami.