Sigh, here's another "it's gotta be dark to be scarey" mentality. You can achieve in the final game only by changing the ambiance number to 0 in the level setup.fpe.
Just a bit of advice, if you post pics that are too dark because you want it scarey, you will be told repeatedly that your pics are too dark. Use some lighting to convey your scareyness. Being dark doesn't make it scarey. Good atmosphere, use of objects, and lighting makes a game scarey. The whole completely dark thing is a childs mentality. That's my opinion and advice for you before you post any pics or even start on your endevor. I hope you take it to heart; it will result in less flaming and negative comments.