>>3803578It's incredibly sad. Your options for the endings without getting into spoilers are "Horribly depressing but with a microscopic glimmer of hope" or soul-crushing destruction of all hope and innocence.
I recommend it, and to avoid spoilers doing so, but do so knowing if you are susceptible to emotional media it WILL fuck you up. I played it a year ago and think on it daily still.
I will spoil one and only one thing without much detail: If you find yourself in a room where it looks like you have only one option, you actually have two, and it's an easier one you've done before. Thankfully I caught this on my own on my playthrough.