I loved it!
Pixel/horror is a pretty overcrowded genre, but I think the sheer quality you put into the thing and the variety in puzzle solution rather than just the ending is just enough spin for this gem to stand out!
I mean, even the small detail, of how the girls turn their heads towards someone entering, alone enhanced my experience!
I have troubles finding alternative solutions but I guess I'm just silly.
I'd like to use a quote "when the game's biggest problem is the lack of it - that's a good sign". And I believe this is the case with your game! You have everything figured out for keeping the player immersed. If you will pull off a fully fledged product with a full meter journey, worked out plot and enough variety in gameplay based on puzzle solutions, I can't possibly see this not getting huge recognition.
Good luck! Rooting for the project!