Please add more endings in the comments
LEVEL 0 ENDING
You ended up in The Backrooms, wandering around the halls for God knows how long. You couldn't find any food or water and eventually turn into a wretch.
LEVEL 1 ENDING
You finally escape the yellow halls of Level 0 and find a settlement of survivors. After finding out the dangers of the future levels, you decide to stay with them to never see the hell of Level 2 and beyond.
LEVEL 2 ENDING (Jerry Ending)
You find a blue bird on Level 2 and it starts to fly at you. You couldn't get away from it and you've now been brainwashed. You now worship Jerry and keep on saying "Jerry is everything." "Jerry is what I lie for." "All hail Jerry".
LEVEL 3 ENDING
You find a pack of hounds and skin stealers in Level 3 and they all start to chase you. The horde is too much to fight off, so you try to run away but you trip on a wire. The entities catch up to you end you know this is the end.
LEVEL 4 ENDING (Based off @Nikodemixen)
You made it to Level 4. You heard this level is pretty safe, but unfortunately, you forgot the #1 tip... don't trust the windows.
LEVEL 5 ENDING (Based off @Nikodemixen)
You found a drawer in Level 5 with tons of supplies, but it was right next to a deathmoth nest you couldn't see. The deathmoths chased you and spit acid on you that burnt you to death.
LEVEL 6 ENDING
You can't see anything... You feel like something is watching you and you're on the verge of insanity. You can't take it anymore, you just can't take it...
LEVEL 7 ENDING
You're in the freezing waters of Level 7. The water is so cold you can barely move. Wait... What's that in the water?!
Level X Ending (By @The Smiler Human)
You've made the mistake of looking at him. Now he is coming to end your life; your mistakes. They weren't lying: there is no escape.