Interesting premise with just a small detail to fix - sound!
I liked the idea of antagonist being invisible. It creates more pressure on the player and gives them the true feeling of dread. Although, that being said, the atmosphere is weak. A little ambience could fix the entire game. No need of footsteps or any other effects, just a small tune, which will set the mood right away.
I do hope the update will bring something better. Overall, the game has a potential and it is really good. Best of luck to you!