Added and fixed some things — Peak Darkness Steam update #273951

I added in a single player mode its not tested completely so I might have some fixes to work out with it but we will see if u find issues let me know. I seen there was some reviews for it so I wanted to put it in. As for the monsters losing u when u get close to walls that has been fixed I still have a few problems I am sure of it no game is perfect and i am always happy to fix the issues we have. I will keep working on this for everyone and keep adding to it hope u enjoy.