Very creative horror game you got here
I like the tense atmosphere you created through the game with the colors you selected and the sounds you picked.
it even looks like a spam submission at a first glance and the appeal of horror is that it sometimes scares you away but curiosity attracts you anyways.
This in of itself is you using an effective technique to make an entertaining horror submission but while all this was great including the screams of terror on some parts.
It just wasn't scary in my point of view because it lacked a sense of danger, a sense of shock and while this may not be needed but sometimes a sense of humor adds entertainment value to a horror movie/game.
The tense atmosphere as i said was great and the simple approach also worked great because the scariest horror movies also happened to be the least polished.
Horror speaks to our most primitive part of our brains and when it is effective it is at it's most scary.
You kept violence, blood and gore to a minimum and this is also effective because you need to sometimes to keep it to a minimum when you want anykind of shock out of your audience when they see it.
Shock helps a little since it plays on the audiences own perversion to keep there attention.
Your game needed a sense of danger mixed with suspense and some shock to be a little more scary.
All you had was a tense atmosphere and mild surprises when you entered the wrong keys.
-PowerRangerYELLOW