Unitologist zealots want to release the power of the Markers, and only Isaac can put a stop to the plans.
15-20 hours to complete the game? I completed it in 10 whilst writing guides and other content. 10 hours tops for a skilled player. There is no struggle for survival. Sit in a corner, waste the Necromorphs and move on. The optional quests are also a waste of time, contrary to what the review says. Hardly anything worthwhile at all, especially considering 2 of them have identical loot rooms with identical mob spawns. Couldn't disagree with this review more, it was well written though and a good read.
If you enjoy the game and like to explore, you'll play it for 15-20 hours. If you go for a speedrun, you'll finish it faster. The game is pure awesomness, but like the article said: "The story could have benefited by a stronger conclusion."
As I mentioned previously, I was writing guides for my website while I was playing the game. I completed 95% of the content with the exception of co-op and I very much doubt they add another 5-10 hours worth of content :D
I actually enjoyed one of the optional missions more than most of the main missions. I'll avoid spoilers, but it involved the guy with the traps on the ship.
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