Really creative concept--though, I do have some criticisms.
Having the entity chase you around constantly kind of kills any incentive for exploration. It puts you in a panic state and the last thing you want to do is spend too much time interacting with your surroundings. Perhaps the entity could have been triggered a little bit later in the game, once you've been given a bit of time to scope out the lay of the land. The fact that the game is monochromatic (not saying it's a bad thing: I appreciate the stylistic choice), and the fact that the architecture/level design is kind of bland, makes it difficult to distinguish where you are--this problem, again, is amplified when you're under stress because of the monster.
I don't want to make it sound like having a monster chase you around is a bad design idea. It's really not. But if implemented better, it wouldn't get in the way of the immersion and exploration aspect of the game (which is what I really like about survival horror).
Other than that, good job. Hope you continue making great games!