I actually love a good horror game, and despite the clever inversion, I still found it similarly thrilling because of how well you balanced it.
It took me a few goes to get a feel for a good scare, but I had an absolute blast playing this. I even played a couple times after getting the S rank aha. The atmosphere is awesome, the detective is responsive enough to not feel frustrating, and clear enough to feel like you're in control and yet scared he might see you prematurely. The visuals match beautifully as well, the music, sounds, bobbing of the monsters viewpoint. All great.
I'd be really keen to see this continue development. Add some accessibility (eg allow the player customise the audio levels, mouse sensitivity etc), fix any bugs (light reflections of the player and the detective were the only things I saw that pulled me out of the experience), some new levels and mechanics etc and it could really take off imo.
Thanks for making this!