I read about this on various other sites this weekend and I was trying it out this morning. It's a Halo "demake" to make the game look like it was made for the Atari 2600. Controls are simple with the arrow keys moving Master Chief and the space bar making him fire his gun. You have to find the gun first and it's one screen up from the stop. I played this for a little bit and it's pretty fun, reminds me of Berserk or Frenzy except you can only shoot left and right. If you have some time to kill it's worth checking out.