This feels kind of like Halo but more horror-themed . . . the art is obviously hand-made and is pretty good, and the speeder ride was a nice addition.
If anyone is wondering, you can beat this; you just need to go to the top of the mountain and collect the grenade? bottle? whatever it is that you get from the corpse (by pressing S near it) and then go back inside the fort and press the red button on the computer over on the right.