The conclusion of the story is worth to play the repetitive scenarios, puzzles and gameplay.
Graphics: Since it is a opengl game I guess based on Doom engine you can tweak the config file to get maximum textures, shadows, lighting, etc. Make sure your PC is powerful enough. It is a shame that I can not post a couple of screen shots so you guy see how much you can get out this game in terms of graphics once you tweak it. Sound: Very Good.
Story: Even when it is a little bit long an not well developed IMO the conclusion is all worthy. You play as a member of a Cherokee reservation who refuses to stay there but there is a little problem, yes a woman who is the reason of his fight through Aliens that abducted her but......you should play the game and find out. Do not read the story or watch videos about how ends the story, I was kind of shocked when I found out by the game what was her fate.