OK, so, spoilers here so don't read if you.. aren't the developer or haven't finished.
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OK. I reached the room with the ladder leading to light, and the hole in the wall with Dina(?) barking. So of course I went in the hole and fought all the giant roaches, then ended up in the disturbing Hell tunnels with the floating chest-hole and swollen head boys. After navigating this I finally reached a new room that seemed normal enough. A door leading one way, a ladder leading to the surface. I climbed up and the dog was just waiting for me. It was sunny and bright and I pet it.. and the screen faded to white. The ending text was something like, "I escaped that hell" so on and so forth.. To be honest, I was kinda pissed off and skimmed it.
I know it's in survival horror nature, but I don't really want to replay the game to seek out more endings.