The last puzzle was kind of challenging and thew me in the loop there!
Modelling and environment are really nicely done, it definitely feels like there was a lot of work and thought put into it. And I like how it's stylized - this renders the game a very coherent look. Very good job with all the smoke and screen effects - there's a lot of attention to detail.
The chasing monster was actually terrifying.
Also, liked the small easter egg with megalovaina on 666 :)