That was incredible. I actually managed to beat it, too! It was VERY difficult, but I appreciated that mostly the level/checkpoint placement was forgiving enough that I was able to get through it by being careful and remembering the map and enemy placement after deaths. The one exception was the second level. I think I might have done this incorrectly, but I started with under half sanity and it was BRUTAL. I nearly gave up. I'm so glad I didn't!
I loved that you controlled two characters, I love that they had individual dialogue, the crossbow and finding more arrows was really neat, and I love the synergy of horror that you had going on. The shadow monsters and stuff were really spooky, and I definitely remained tense all the way through. It also had my favorite horror thing, though, which is a bright spot of hope. I thought it was kinda cute that you as the fairy could kind of "protect" Sophia from seeing things that would scare her by being careful with your light placement.
Very challenging, very scary, very cool idea, really well executed. If you make a full game of this (which I hope you do), please release it; I will absolutely buy it.
GREAT JOB!!!