I splashed out on Steam's "bargain of the week": the Penumbra Collector pack giving you the complete set of this episodic horror adventure including "Overture", "Black Plague" and "Requiem" for only a fiver.
The general review consensus seems to be that the low budget series is a bit rough around the edges but does deliver genuine scariness. I planned on giving it a go with the lights off and headphones on for maximally terrifying immersion.
Sadly I cannot give you more than the barest of first impressions because I quickly found that the low quality graphics and dimly lit corridor setting combined to make me nauseous. Back in the days of Doom I actually forced my way through nausea to play but those days are gone and unless I can find a graphics setting that solves the nausea issue I will write off my €5 investment in this game.