I pirated the game and when i saw the intro to the game i instantly uninstalled and bought it on Steam.
The core gameplay is extremely simple, but a lot of enemies attack you in diagonal angles, and your cross doesn't cover them well, so you have to consider how you position yourself on the screen to face the enemy. This decision was key to not make the game too easy, which would also make it less scary.
You can feel the passion of the devs on every aspect of the game, and it's incredible how much it can spook you with such a minimalistic approach.
The "I'm here, John" segment has to be one of my favorite moments in a horror game.