about 1.3 GB, don't download it.
The production values are really good with good voice acting, lip-synching, graphics, and even physics. Gameplay was pretty broken.
For the gunfighting, the enemies were stupid and would stand around and not take immediately take cover. Most of the enemies are waiting together in a room and easy to clear out. You also usually outgun the enemy because you can have two guns or SMG's. The auto-aim was pretty obscene too. It should not auto-aim at a guy 50 yards away when you have pistols.
Darkness powers were all right. There were only two in the demo: The tentacle thing to poke out lights and throw things and the thing that can creep on the ground and sneak up on people to bite them. It was pretty stupid in a lot of the parts since you couldn't use the powers in a lit area.
The demo only had one puzzle involving the gasoline can and it doesn't even tell you you can use it until you pick it up. Why it lets you turn on the saws in the machine shop as well I don't know.
The graphics were really good but it was only a few character models and small environments so it's not amazing.