If you played the demo on my mod and the 1.0 update, then this ending was in my mod My Cloudy Reality. (The OG not MCR Plus) 

I felt like it had more pentanal being a mod of its own, so it was removed from the mod in the newer version. My team and I are working on redesigning the characters and adding more to the story since it'll be its own mod, but I hope for it to come out some time in summer or fall of 2025.