Space Hulk is a game about how terrible it would be if you and all your friends were the size of refridgerators, and you all lived in a house made of hallways so you had to walk everywhere single file, and the house contained an unlimited amount of aliens that wanted to kill you.
Space Hulk is a turn based strategy game that seems to be a pretty faithul digital recreation of the Games Workshop boardgame, transparency included (You can see the results of all dice rolls). Throughout the game, you lead a squad (sometimes 2) of Blood Angel Terminators through a space hulk, which seems to be a ton of spaceships that have fused together in ridiculous ways. You're given a different objectve in every mission and as you attempt to fulfill it, Tyranid Genestealers spawn from multiple spawn points in an attempt to overwhelm your squad. In order to complete your mission, you have to take and hold positions against the Genestealers and accomplish the objective, quietly hoping you never have to assault through them.
At the beginning of each mission, you're given somewhere between 2-12 Terminators, each with their own equipment and abilities, and an objective to fulfill. Each Terminator gets 4 action points at the start of a turn, and the whole squad shares a pool of 1-6 extra points called "Command Points", which allows Terminators to perform actions outside of their allotted 4 points. You'll move your Terminators through the narrow corridors, carefully stacking them in formation, always being wary of lines of sight and lanes of approach to reach whatever your objective maybe.
This is a game about positioning, planning, and risk management. With the exception of a couple of missions, you'll never be able to kill all the genestealers, they simply keep coming and coming until you accomplish your objective and/or all of your troops are dead. So, you have to establish a good defensive position, preferably with long lines of sight. Overwatch is the most powerful ability in the game, and one that allows you to shoot at all approaching enemies as long as your bolter doesn't jam (On each shot, you roll two dice, and any time you roll doubles your bolter jams). This allows you to dominate corridors, though a Genestealer can still slip past if your roll low enough consistently. Sometimes, the most tempting positions are ones that are only a few squares long, and you have to decide if the risk of only having a few squares to shoot at is worth sparing only one Terminator for that position. If the overwatch fails, you could find yourself overrun. Or, you can use 2 Terminators to guard 2 longer corridors, removing one from use in another portion of the map.
It's a fun game, and the dependence on luck makes it incredibly tense. Granted, you can mitigate risk, but you'll never be able to remove it completely. My understanding of the game is that its relsease was filled with all sort of weird glitches and problems, but I haven't encountered a single one yet. I haven't had a chance to try mutliplayer yet, so I can't comment on that.
If you're a fan of careful, deliberate, tense strategy, I highly recommend this. I'm nearly done with the main campaign and enjoyed every minute of it, and I'm looking forward to moving on to the DLC.
What I paid for it: 10 dollars
What I would pay for it: 25 dollars.
For context, I know very little about WH40K and didn't even know the board game existed until playing this. All of the above impressions were based on playing on Normal.