Hey, I checked your game :)
- nice title screen and really nice music, reminded me of Silent Hill 2 :) Nothing better to set the atmosphere.
- I love that you added some 'Options' there, often overlooked, including my game :)
- very interesting scenario!
- I am used to WASD for movement and QE for turning, but was quickly used to the game, just nitpicking :)
- I really loved the variety of walls and drawings on them, really added a lot to atmosphere
- there's a tutorial "computer" there that informs you to "strafe with Q and E" but that's wrong :)
- really surprised by Shlak's ability to go into vents, loved the idea of selecting a character!
- nice to see entries made with anything else of Unity and Unreal.. Gamemaker did pretty good here.
- I loved the organization of files and work in JSON files, nice compact work.
Overall, really well made game and I expect to see this one becoming something more in the future :)