It is fun; and for $8 fine i guess; but it is also short and after playing twice I can't really see a reason to paly again (unless there is a sequel and I desire to remember what happeend in the first game).
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What I really liked was when these games were a bit longer....
It was long enough for me on the hardest difficulty some levels I needed to replay several times in order to find a way to pass through. But , for some reason, it didn't bother me because kill mechanic is excellent in this game.