Didnt they say it will be multiplayer?

I saw only two endings. The one where you get into the car after going to -6. And the one when you get into the elevator and you die. I saw on a YT video that there were 4 endings. Can somebody tell me which endings I am missing ?

Everyone is talking about the -6 levels after you hit 0, but I ended up back at 50 instead of a negative number and all the lights were off which made everything a hundred times more difficult and frustrating. Any ideas why some people get negative numbers and some are sent back to 50 with the lights off?...

What a load of ♥♥♥♥, steam needs to get rid of the f2p category is full of crap

I want to play this but I'm a bit sensitive to jumpscares. Any clues for when a jumpscare is about to happen in the game? I don't mind spoilers if that helps to give a full explanation.