To add to Sessha's description, the game's much scarier than others because the enemies aren't material. A zombie can only move so much and rips apart when you shoot it but in FF the enemies are ghosts that often turn invisible and reappear somewhere completely different so when one disappears you'll frantically search the area around you hoping you'll spot it before it reaches you (which does quite some damage). Also they're often invisible at first so you'll only know a ghost is there because your "sixth sense" indicator pops up. Even nastier, the indicator cannot tell between friend or foe so you'll sometimes have it pop up on a harmless apparition. Also adds to the fun when a ghost spawns in an area you had cleared before.
I'm not sure if accurate aim will help this, faster response means you're less vulnerable and less vulnerability means enemies are less dangerous. But Killer7 had similar enemies so Grasshopper should beable to handle this.