*****************************SPOILERS****************************
*******************HINTS INCLUDED-SOLUTION DENIED*******************
FINAL CONCLUSION, In the game, sandy try to call you aka the player , she couldn't get to the phone, because she got murdered on that date she ran to the pier(like in the video you linked), since then the guy built the game to try to resurrect her, at that point, you try and play the game but your interfering, the ghost is running towards the player in the game is indeed sandy(where she's running for help(end of the pier)) he murdered his wife, and regretted it, hence made the game and resurrect her, because people write in the killed persons blood are usually serial killers, the person who is telling you to stop is the murderer(SKiller), the soul stealer, is in the game, cuz it is the trap to take your soul to resurrect sandy. SANDY, plants your details in the registry of your computer in hopes that you find the missing clues to relate all of the above , and crack the case to help kill/arrest her husband.
WOW, best game ever! (i hope someone else reaches this p
Since its reverse, she was at the pier walking her dog, the killer(husband) showed up, she ran to the house, and wanted to call the player or 911 for help then she died.
Hence the hand in blood at the phone in the picture. SHOWN IN VERY FULL SCREEN ITS BLURRY, ALSO, It's not a Image file like Jpg or Png. so i couldn't get the original photo.
i did however find the unedited version by using google image search(not hard)
She died on the floor there 
. (p.s thats her death when she picked up the phone, something recorded the exact time something like a VHS?)
*****WARNING***** this game does fuck with your regedit creating two registries, one with your Initials of your name and DOB(dont be shocked at this), a clue, the other , is 3 clues to find out more of the conclusion I will ;
however leave you with a couple of hints, and new evidence towards the game, HAVE FUN!!! (finding her Date of birth was the hardest) it has something to do with the regedit/the soul stealer room, and the times you shoot before you reload, and being able to move using Q and Z, also , look for O480AKE which relates to this button below :D
GOOD LUCK!