I wouldn't really say scary as much as eerie, in that all the scariness is all in your head. I played it through again recently and I'll admit that I was a bit on edge at first, having little ammo and with all the enemies seemingly appearing out of nowhere (gray enemies, gray locations, low definition game on HD TV), but once I realised that they didn't really pose any threat since they have the speed of glaciers, it was 'just' a really good action game.