Good concept, but I'm not sure about the art style, and some of the gameplay.
Brown walls mixed with a blurry wood texture. Repeat textures if possible, don't stretch pixel art. Also, there is also normal art, and pixel art. Stick with a style if possible. The overall game play is also not in my liking. This is just to do with the concept. It's good that you flash the first time, but don't do it again! They are hidden the second time, and that is an easy way to be tricked, in a bad way. Also, them roaming about is scary, but I feel it might lead to unfair game play. This page also... Why a green-gray, and a brown?
It has it's positives, but these things really stop me from saying it's as good as it could've been. Good attempt, hope you update it with all these points in mind!