A horror game with Playstation 2 graphics...lost?

A while ago, I was talking about nostalgia and childhood with my brother and we remembered when we used to go to an internet cafe to use the computers just for games and YouTube videos. In the middle of our conversation we remembered a horror game that was downloaded on all computers which we remembered with frustration because it was very difficult.The thing is, neither of us remembers the name of the game, and over the years we've forgotten many details and features that game had.

My brother remembers that the game had Playstation 2 graphics (very similar to those of the GTA games in the 2000s) with a dark green color panel I only remember that the game had cutscenes and that one of the levels that was difficult for us was about a man with chainsaws and a knight's helmet of a turquoise hue. The game ends with the protagonist fleeing, and a purple/fuchsia demon is also shown screaming from the rooftop. 

We're really keen to find this game again, so we need your help.