A first-person shooter with some interesting concepts but ultimately a mess of a game.
Now, that's not a big deal on it's own. Most games don't have portals and wall-walking so if the rest of the game is good then who cares, right? Except the rest of the game stinks. Every area in the game looks the same, nothing is connected or designed in any logical way. It feels like someone designed one room, then threw it in some randomizing machine until they got 20 or 30 slightly different rooms, then connected them all with hallways and portals and called it a game.
The rest of the game is not as terrible as the level design. The core shooting action gameplay is average. Some of the weapons are inventive and fun to use. The last hour or two of the game had a pretty good flow to it, I was having enough fun by the end to ignore the bad design choices.
Of course, the end came pretty quickly. I completed the game in approximately 8 hours, and I generally take longer than most people to complete games (although in Prey's case I was moving pretty quick since the levels all looked and played alike there was no reason to hang around). And in addition to being short, the game is very easy. When you "die" you just go into the "spirit world" and shoot blue and red flying creatures for about 15 seconds then you're put back in the exact same position like nothing happened. Pretty silly.
Oh, and there's the spirit form which you occasionally have to go into to solve a puzzle. Not a bad idea, except every "puzzle" is identical. Go into spirit form, walk through force field, push a button, exit spirit form. Yeah I didn't get bored of that after the first 12 times.
They could've had a lot of fun messing with the player's head in this game, instead we get an average shooter with some poorly executed gimmicks thrown on top that takes place in an alien world designed by idiots. Ugh.
Oh yeah, I haven't spent much time in multiplayer, so I don't feel comfortable reviewing that. But let's just say, I'm probably not going to spend any more time with it than I already have.