This post is for what content from previous updates didn't make it into the current version and why they are gone

Chaos ending: 0.1.1-0.1.4  (REVIVED AS OF 0.1.6)
Cause of death: The portal mod being corrupted and placing you in space instead of the modified mirror dimension, thus, you can't access the corrupted mountain

Backrooms ending (and the Serious dedication achievement): 0.1.1-0.1.5
Cause of death: The backrooms being updated and getting rid of the standard Backrooms ending and achievement

Old Final ending: 0.1.0-0.1.4
Cause of death: Being edited to be different