I just started playing that one and it's scarier than the other two SHs I played on my PS2, The Room and Shattered Memories.
I'm in the mall, near the subway exit but I left some rooms unexplored on the previous floors. Mostly because I had no choice but running away after I encountered a pack of monsters and was short on bullets.
My current equipment is the bulleproof vest, a gun with around 30 bullets, a shitty ass worthless knife, 4 beef jerkies and several healing items.
I want to go back and explore a bit more but I don't think this equipment is enough to go and just fight my way through, most of the doors will have the lock broken anyway but I may have missed something back there.
My biggest problem are those large creatures that impale you when you get near them, there are so many now

I probably should just keep going but I want to go back to make sure I didn't miss any really useful item, besides, even if I forget that and keep going I'll be encountering more of these so I could use a basic tactic to beat them without using too many bullets.
Any tips on how to beat these creatures fast?