I've played it around thirty times or more and managed to finish it once.  Let me know if any of you can get to the end, the five people I've played it to in my family couldn't even beat level one.  I can offer tips and advice; it's much like the older games, when it was about knowing the level inside out and playing it fifty times to learn every inch than about brutality and running headlong into it like many such games now.  Running up to enemies... ya gonna get killed.