The game is based on the Doom 3 Engine and apparently on the Doom premise as well. While Doom 3 simply bored me, this game really managed to scare me. The first game ever that managed to do that.
Like HL2, Prey is a linear 3D shooter game, but unlike HL2, it doesn't hurt here, as you are moving along in the intestines of a half-biological alien spaceship that has abducted you (heh, finally a game about this
![Razz :P](./images/smilies/icon_razz.gif)
Your in-game character is Cherokee, and as such has access to his people's special power of spirit walking, i.e. you can move around with your spirit, leaving your body behind and thus reach otherwise inaccessible areas.
I found a special physics trait to be a special treat and surprise: Gravity is tied to surfaces, so there are areas you can walk upside down, or flip floor, walls and ceilings around by shooting special triggers (which forms some nice riddles).
Another cool engine feature was portals leading to other regions of the game. Some portals were formed by one side of cubic crates displaying the destination area like a mirror. Very cool idea.
Voice acting was mediocre which took a little away, but not too much.
The environments are pulled off very well with a lot of detail and surprising vistas.
I really enjoyed it. It was worth the 460 MB download (WorthPlaying offers fast downloads - you have to find the right one though).